Answer:
sexual dimorphism
Explanation:
Dimorphism means having two different forms, therefore sexual dimorphism is a phenomenal where two sexes of the same species will exhibit different characteristics apart from having different sex organs.
When John was young he could sing soprano because he had not yet undergone puberty. One of the changes that happens in boys is the change in voice which only happens to males making them different from females.
The change in voice that occurs in boys, like the transition Johann Sebastian Bach experienced, is a characteristic of puberty. This is due to an increase in the production of androgens, which leads to the growth of the larynx and the deepening of the voice.
Explanation:The change in voice that is mentioned about Johann Sebastian Bach, is a characteristic of puberty in males. Puberty is a biological stage during which a child's body matures into an adult capable of sexual reproduction. It is marked by a rapid growth spurt and the appearance of secondary sexual characteristics, including voice deepening in boys.
This change occurs due to the increased production of androgens—the male sex hormones, particularly testosterone, which causes the larynx (or voice box) to grow and the vocal cords to lengthen and thicken, resulting in a lower-pitched voice. This period of change is an integral part of human development.
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Assuming chimps and gorillas are humans' closest relatives, removing humans from the great ape clade and placing them in a different clade has the effect of making the phylogenetic tree of the great apes _______.
A) polyphyletic
B) into a new order
C) monophyletic
D) paraphyletic
Answer:
c
Explanation:
Repeated use of a drug or alcohol to the point of periodic or chronic intoxication that is detrimental to the user or society is called ________.
Answer: Drug abuse
Explanation:
Repeated use of a drug or alcohol to the point of periodic or chronic intoxication that is detrimental to the user or society is called drug abuse or substance abuse.
Substance abuse or drug misuse, is use of a drug or substances in overdose amounts that for the purpose of intoxication or mood alteration. Most drugs abused have properties that are sedative, stimulants among many other properties.
Drug misuse have detrimental and adverse effects on both the individual and the society at large
if you selected the correct answer above, this means that you realized that natural selection is at play here. identify the four postulates
Answer:
Explanation:
•Variation: Organism shows variation within a population, these variation could be body size, facial marks, hair color, number of offspring, etc. Also some features shows little or no variation, for example the number of eyes a vertebrate have, etc
•Inheritance: Certain traits are always passed from parents to their offsprings, these traits are called HERITABLE TRAITS. But traits that are exhibited as a result of an environment are termed weak heritable traits.
•High rate of population growth: When the number of offsprings produced in a year is greater than the resources within an environment, such population will experience high rate of mortality.
•Differential Survival and reproduction: The ability possessed by an individual to struggle for survival within it's environment will give rise to more offspring in the next generation.
A test was given to a group of students. The grades and gender are summarized below A B C Total Male 5 18 8 31 Female 9 7 16 32 Total 14 25 24 63 If one student is chosen at random from those who took the test, Find the probability that the student got a 'C' GIVEN they are male.
Answer:
Pr. (male) = 0.49
Explanation:
A B C TOTAL
male 5 18 8 31
female 9 7 16 32
TOTAL 14 25 24 63
Now to find the probability that the student got a 'C' given they are male, we need to know the total numbers of males(i.e no of required outcomes) which = 31
also the total number of the group of students(i.e total no of possible outcomes) = 63
∴ Since Probability = [tex]\frac{no of required outcomes}{total no of possible outcomes}[/tex]
we have Pr (male) = [tex]\frac{31}{63}[/tex]
=0.49
Which of the following describes osmosis?
a. Oxygen transfers into red blood cells through small gaps in the cell membrane from the oxygen- rich environment surrounding the cells
b. Large molecules are brought into the cell by wrapping the cell membrane around the molecules to form a vacuole.
c. Water moves across the cell membrane from the side with high osmotic pressure towards the side with low osmotic pressure.
d. Membrane proteins provide a pathway for larger particles to move across the cell membrane and bring the cell and environment closer to equilibrium.
Answer:
The correct option is C.
Explanation:
Osmosis is a good example of passive transport. In this transport across the cell membrane without any input of cellular energy movement of atomic substance occurs.
Osmosis is defined as the movement of water across the selectively permeable cell membrane from the high osmotic pressure potential towards the area of low osmotic pressure potential. Some examples of osmosis are skin soaking up water, plants receiving water, and when exposed to freshwater red blood cells swelling up.
Osmosis, described in option 'c', is the movement of water from a high to a low concentration through a semi-permeable cell membrane. It aims at achieving a equilibrium state, and is present in various biological processes like water absorption in plant cells.
Explanation:The process that best describes osmosis is option 'c'. Osmosis is the movement of water across a semi-permeable cell membrane from an area of high water concentration (or high osmotic pressure) to an area of low water concentration (or low osmotic pressure). This natural process aims to achieve a state of equilibrium, where the water concentration is the same on both sides of the membrane.
To provide an example, plant cells use osmosis to absorb water from the soil. Inside the cell is a solution with various solutes. Compared to the surrounding soil, this solution has lower water concentration or higher osmotic pressure. Therefore, water from the soil enters the plant cell via osmosis, moving from an area of high water concentration to low water concentration.
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The DNA content of a diploid cell in the G1 phase of the cell cycle is measured. If the DNA content is x, then the DNA content at metaphase of meiosis II would be:
Answer:
2x
Explanation:
The G1 phase is a part of the interphase stage of the cell cycle, where the cell undergoes resting and preparation prior to division. Before division can occur, the cell needs to replicate its genetic material (DNA). The cell does this at the S-PHASE, after the First Gap or G1 phase.
The cell duplicates its DNA in order to ensure that each daughter cell receives equal and correct number of chromosomes (DNA). Hence, if the measured DNA at G1 phase was (x), it replicates/doubles I.e x+x or x × 2 = 2x.
Therefore, at the Metaphase phase (division), the DNA content will be 2x before they separate in the anaphase stage.
If the DNA content of a diploid cell is x in the G1 phase, by metaphase of meiosis II the DNA content would be x/2, since meiosis reduces the chromosome number by half to the haploid state.
The question posed relates to the changes in DNA content throughout the cell cycle, particularly from the G1 phase of interphase to metaphase of meiosis II. In the G1 phase, a diploid cell has a DNA content represented by x or 2c, which stands for two sets of chromosomes (2n). When a cell undergoes meiosis, it starts with a doubled DNA content (4c after S phase), but through meiosis I and meiosis II, the DNA content and number of chromosomes are halved. By metaphase of meiosis II, the cell has completed meiosis I and has halved its chromosome number already to 2c (1n, where n represents the number of complete sets of chromosomes).
Therefore, if the DNA content is x (2c) in the G1 phase, at metaphase of meiosis II, the DNA content would be x/2 (the haploid content or 1c), since meiosis reduces the chromosome number by half.
A football quarterback can simultaneously make calculations of receiver distances, player movements, and gravitational forces. This best illustrates the activity of multiple ________.a. endocrine glandsb. endorphin agonists
c. neural networks
d. endorphin antagonists
e. thresholds
Answer: Neural networks
Explanation:
The brain woks by combination of the networks. There are different types of neurons that combines together to function.
The network of neurons that are combined together in such a way to process the data.
It has the ability to process data in such a way that multiple function can be performed together like decision making, receiver distance, et cetera.
Cytoplasm A) A process in which electrons are transferred from one compound to another with a release of energy occurring in the production of ATP A Electron transport chain B) An organic molecule that occurs as an intermediate in many metabolic processes C Fermentation C) The chemical breakdown of a substance B Pyruvate D) The gel-like material within a living cell
Answer:
D) The gel-like material within a living cell
Answer:D) The gel-like material within a living cell
Explanation: Cytoplasm are materials within the cell erxcept the nucleus. Its a gel like material and also known as cytosol. It is made up of water,enzymes,salt etc.
The protein building instructions must be sent out to the cytoplasm. A copy of the instructions is made in the form of ________. This process is called ______________________.
Answer:
1. RNA
2. Transcription
Explanation:
DNA stores the instructions required for the synthesis of proteins. However, the sequence of DNA does not directly serve as a template for protein synthesis. Rather, the template DNA strand is copied into the RNA. The process is called transcription.
The RNA in eukaryotes undergo modifications such as removal of introns and the addition of specific sequences at its 3' and 5' end. This mature mRNA that joins ribosomes for protein synthesis. The nucleotide sequence of mRNA is read in the form of triplets and each triplet code for a specific amino acid.
Which of these statements is correct?
A. Scientific ideas are subjected to repeated testing.
B. Science can be used to prove or disprove the idea that deities or spirits cause earthquakes and other natural disasters.
C. Science does not require observations that other people can confirm.
D. Only discovery science can lead to important conclusions about nature.
Final answer:
The correct statement is that scientific ideas are subjected to repeated testing (A). Science focuses on the natural world and relies on observations that other researchers can confirm. Discovery and hypothesis-driven scientific approaches are both valuable for making conclusions about nature.
Explanation:
The correct statement among the options provided is A. Scientific ideas are subjected to repeated testing. This is a fundamental aspect of the scientific method, which involves formulating hypotheses and then conducting experiments and making observations to test these hypotheses. The results are then analyzed, and conclusions are drawn, which may either support or refute the hypotheses. This process can lead to revisions or further testing, contributing to a more accurate understanding of the natural world.
Maria loves to dance. She has noticed that whenever she dances, she has more energy the next day. Maria has noticed a __________ correlation.
Answer:
Maria noticed a positive correlation
Explanation:
Correlation is used to measure the extend to which two or more variables are related.
It can be positive where one variable increases when the other increases.
Negative where the increase of one aspect decrease the other variable.
Lastly, no correlation means there is no relationship between the two variables hence a change in one will not affect the other.
In the case of maria, there is a positive correlation between having more energy the next day and her dancing.
Which of the following hormones is released by the anterior pituitary as a part of that positive feedback loop between it and the ovary?
The anterior pituitary releases LH and FSH as part of the positive feedback loop with the ovary, triggered by high levels of estrogen leading to ovulation.
Explanation:The hormone released by the anterior pituitary as a part of the positive feedback loop between it and the ovary is LH (Luteinizing Hormone) and FSH (Follicle Stimulating Hormone). This occurs when the dominant follicle in the ovary secretes a large amount of estrogen, which in normal cases would exert a negative feedback. However, when estrogen levels are extremely high, they instead trigger a positive feedback loop, causing the anterior pituitary to release significant amounts of LH and FSH into the bloodstream. This event predominantly happens during the ovulation phase of the menstrual cycle, signaling one of the key steps that lead to ovulation.
Luteinizing hormone (LH) is released by the anterior pituitary in the positive feedback loop between it and the ovary.
Let's break down the options:
A) Progesterone: Progesterone is not released by the anterior pituitary; it is primarily produced by the corpus luteum in the ovary.
B) Luteinizing hormone (LH): LH is indeed released by the anterior pituitary and plays a crucial role in the positive feedback loop between the anterior pituitary and the ovary during the menstrual cycle.
C) Gonadotropin releasing hormone (GnRH): GnRH is released by the hypothalamus, not the anterior pituitary. It stimulates the release of LH and follicle-stimulating hormone (FSH) from the anterior pituitary.
D) Estrogen: Estrogen is primarily produced by the developing follicles in the ovary, not the anterior pituitary.
E) Gonadotropin: This term refers to hormones that stimulate the gonads (ovaries and testes), such as LH and FSH. "Gonadotropin" alone does not specify a particular hormone released by the anterior pituitary.
Therefore, the correct answer is: B) Luteinizing hormone
Luteinizing hormone (LH) is released by the anterior pituitary as part of the positive feedback loop between it and the ovary during the menstrual cycle.
The complete question is here:
Which of the following hormones is released by the anterior pituitary as a part of that positive feedback loop between it and the ovary?
A) Progesterone
B) Luteinizing hormone
C) Gonadotropin releasing hormone
D) Estrogen
E) Gonadotropin
Every deliberate action you make, such as pedaling a bike, walking, scratching, or smelling a flower, involves neurons in the ________ nervous system.a) sympathetic
b) somatic
c) parasympathetic
d) autonomic
Answer:
b. Somatic
Explanation:
The somatic nervous system is one of the divisions of the peripheral nervous system. The somatic nervous system delivers the motor information from the central nervous system to the skeletal muscles only. The skeletal muscles generate the responses which are consciously controlled. Therefore, the somatic nervous system regulates the voluntary movements of the body.
So, the voluntary movements of skeletal muscles such as the movement of limbs during walking, smelling a flower, pedaling, etc. are regulated by the neurons of somatic division.
Title II of the Sarbanes-Oxley Act prohibits registered public accounting firms from providing certain nonaudit services. These services include all of the following except:
Answer:
A.
tax preparation services.
Starting with the smallest level of ecological organization and moving toward the highest, the order should go organism, __________.
Answer: population, community, ecosystem and biosphere
Explanation:
In ecological organization, the smallest level is Organism level (a unit representative).
Population level comes next after the Organism level. Population refers to the total number of organisms of the same species inhabiting a geographical area.
Then, Community level comes next after population level. A refers to group of plants, animals and other living components functioning in their non-living environment.
Ecosystem level is the next after community level. An ecosystem refers to the aggregate of living organisms interacting with the non-living components in an environment.
Lastly, Biosphere is the highest level in ecological organization. Biosphere refers to the part of the earth where living organisms occupies.
Answer: Individual, population, community, ecosystem, biome and biosphere .
Explanation:
The levels of ecological organization are individual, population, community, ecosystem, biome and biosphere . They describe the arrangement of biological organisms in relation to each other, being a classification and organization of the various ecosystems. These ecosystems can be studied at small or large levels. At the simplest level of the hierarchy are the individual organisms, where interactions with other organisms are not considered. As the hierarchy has moved upwards, environmentalists have found more complex ways to describe the relationships between organisms. These culminate in the biosphere, which describes the totality of all living things on planet Earth.
Individual: Individuals or organisms constitute the basic unit of study in ecology. At this level, form, physiology, behaviour, distribution and adaptations to environmental conditions are studied. Similar organisms or individuals have the potential to cross over and produce fertile offspring. An individual or organism is fully adapted to its environment.Population: An ecological population is made up of a group of individuals of a given species living in a specific geographical area at a given time and functioning as a biotic community unit. Populations include individuals of the same species, but may have different genetic characteristics such as the color and size of hair, eyes and skin between them and other populations.Community: They include all populations in a specific area at a given time. A community includes populations of organisms of different species. For example, populations of fish, salmon, crabs and herring coexist in a defined location forming an ecological community. Biotic community organization results from the interdependence and interactions between populations of different species in a habitat. It is a set of populations of plants, animals, bacteria and fungi that live in an area and interact with each other.Ecosystem: Ecosystems are the place where living organisms interact with each other and with their physical environment. It is composed of a biotic community, integrated with its physical environment through the exchange of energy and recycling of nutrients. An ecosystem has two basic components: abiotic (non-living) and biotic (living organisms). Abiotic components comprise inorganic materials such as carbon, nitrogen, oxygen, CO2, water, etc., while biotic components include producers, consumers and decomposers.Biome: It is a set of ecosystems that share similar characteristics with their abiotic factors adapted to their environment. Biomes are units of land with a natural boundary that have a mosaic of terrains generally representing different ecosystems. It is a large regional unit characterized by an important type of vegetation and associated fauna found in a specific climatic zone.Biosphere : When we consider all the different biomes, each mixed into the other, with all the human beings living in many different geographical areas, we form a huge community of human beings, animals, plants and microorganisms in their defined habitats. A biosphere is the sum of all the established ecosystems on planet Earth. It is the living (and decomposing) component of the Earth system. The entire inhabited part of the earth and its atmosphere, including the living components are called the biosphere.The practitioner carefully monitors his client who exhibits hemoglobin S (HbS) genes. The practitioner know that the client is predisposed to life-threatening infection due to damage by HbS to which of the following organs?
-Spleen
-Lungs
-Heart
-Pancreas
Answer:
Answer is spleen.
Explanation:
Spleen is an organ in the body, and responsible for various actions like blood purification, removal of damaged blood cells and production of white blood cell.
Splenic sequestation is a situation where the spleen becomes enlarged. And this is common to sickle cell anemia people, especially the children. That is , the shape of the red blood cells are sickle.
In this case , the spleen becomes bigger , and the amount of oxygenated blood cells in the body are reduced.
An adult daughter whose mother has bipolar disorder is concerned that she may also have the disorder because she engages in all of the following behaviors. Which behavior should be explored further as a manifestation of bipolar disorder?
Answer:
Making frequent purchases of expensive clothing that she never wears
Explanation:
A 60-year-old man complains of chest pain. He is conscious and alert and denies shortness of breath. Which of the following questions would be the MOST appropriate to ask him?
Answer: "Do you have any heart problems or take any medications?"
Explanation:
The most suitable question to ask a 60-year-old man with chest pain is whether he was exerting himself when the pain began, as this helps discern if the pain is angina related to physical activity, a common symptom of coronary heart disease. Option A is correct.
When assessing a 60-year-old man complaining of chest pain who is conscious, alert, and denies shortness of breath, the most appropriate question to ask would be "Were you exerting yourself when the chest pain began?" This question helps determine if the chest pain, described as angina, is related to physical activity, which is a typical characteristic of ischemic chest pain due to coronary artery disease.
It's essential to identify if the pain is stable angina, which usually occurs with exertion and is relieved by rest, or whether it indicates a more emergent condition such as an acute myocardial infarction. Additional critical questions would involve inquiring about pain radiation to the arms, as angina pain can often spread to the arms, neck, jaw, back, or feel like indigestion. Given that any chest pain could potentially be a sign of a serious condition, thorough and immediate assessment by a medical professional is crucial.
Hence, A. is the correct option.
The complete question is:
A 60-year-old man complains of chest pain. He is conscious and alert and denies shortness of breath. Which of the following questions would be the MOST appropriate to ask him?
Select one:
A "Were you exerting yourself when the chest pain began?"
B "Do you have any heart problems or take any medications?"
C "Does the pain in your chest feel like a stabbing sensation?"
D "Does the pain in your chest move to either of your arms?"
A client with a myocardial infarction (MI) develops pulmonary crackles and dyspnea. A chest X-ray shows evidence of pulmonary edema. The specific type of MI the client had is most probably:
Answer: The client may have ruptured ventricular septa because of MI which may cause cardiogenic pulmonary edema.
Explanation:
When the heart is not able to beat properly and propel the blood forward into the body through aorta, blood can regurgitate into the lungs through pulmonary veins. Due to inceeased backup pressure in the veins, fluid may leak out of the vessels and therefore can be accumulated in the air spaces causing edema. This cardiogenic pulmonary edema causes dyspnea.
Which protective covering of the brain provides passageways for cerebrospinal fluid (CSF) to drain into the superior sagittal sinus?a. periosteal part of the dura materb. membranous part of the dura materc. arachnoid materd. pia mater
Answer:
The correct answer is C) arachnoid mater.
Explanation:
Arachnoid mater, along with pia mater and dura mater, form the meninges, a very thick membrane that protects the brain and the spinal cord. The arachnoid mater is in the middle of the other two layers and it is very important since it holds the cerebrospinal fluid (CSF) in its interior. Arachnoid mater has finger-like projections that enter the dural venous sinuses and are called arachnoid villi. These villi are responsible for the diffusion of CSF into the blood.
Which term best describes coal, water, and wood?
A
man-made resources
B
renewable resources
C
non-renewable resources
D
natural resources
Coal, water, and wood are best described as natural resources. Coal is non-renewable, whereas water and wood can be renewable if properly managed, making 'natural resources' the umbrella term that accurately categorizes all three.
The question asks which term best describes coal, water, and wood. The best answer is D, natural resources. Natural resources are materials or substances that occur in the natural environment and can be used for economic gain. They are divided into two main categories: renewable and non-renewable resources. Coal is a non-renewable resource, as it does not regenerate at a rate that can sustain its consumption. Water and wood, however, can be considered renewable resources if managed properly; water cycles through the environment, and forests can be replanted and replenished. Therefore, the inclusion of both renewable and non-renewable items in the list points to the broader category of natural resources as the correct answer.
D) Natural resources - Coal, water, and wood are naturally occurring substances essential for various human activities and ecosystem functioning.
Coal, water, and wood are all examples of natural resources. Natural resources are materials or substances that occur naturally in the environment and are used by humans for various purposes. Coal is a fossil fuel formed from the remains of plants that lived millions of years ago.
Water is a vital resource that occurs naturally in lakes, rivers, oceans, and groundwater, and is essential for life and various human activities. Wood comes from trees and is used for construction, fuel, and various other purposes.
These resources are considered natural because they are not created by human intervention but rather exist naturally in the environment. While some natural resources, like wood, can be renewable if managed sustainably, others, like coal, are non-renewable and finite in supply.
However, all of these resources are fundamentally derived from natural processes and are essential for supporting human civilization and the functioning of ecosystems.
The correct option is D) natural resources.
The cumulative biological war and tear that results from responses to stress that to maintain body equilibrium is known as:___________
Answer:
The cumulative biological war and tear that results from responses to stress that to main body equilibrium is known as Allostatic load
Explanation:
This condition results from excess cycle of response as they want to maintain allostasis when different environmental challenge takes place.In such cases, imbalance occur in those hormones( glucocorticoid, catecholamine,cytokines) which are responsible for stress.Chronic dysregulation causes cumulative physiological risk and causes disease by damaging the tissue and major organ system.
is a collections of 250 to 800 million neural fibers that connect the left and right hemispheres of the brain, permitting them to communicate and coordinate processing
Answer:
Corpus callosum
Explanation:
Corpus callosum is the red part of the brain that has a “C” shape. The corpus callosum, which is made up of over 200 million of neural fibers, links both hemispheres of the brain (the left and right brain) together, which allows for coordination and complex communication between both in order for the brain to function properly.
This structure usually starts forming about 12 weeks after conception of a child, and continues to develop up to about 12 years of age of the child.
The main function of the corpus callosum is the ensuring of uninterrupted flow of information, and the integration of complex information and tasks such as motor, sensory and cognitive functions between both hemispheres of the brain.
"Which theory suggests that input from touch fibers competes with input from pain receptors, possibly preventing pain messages from reaching the brain?"
Answer:
Gate theory of pain
Explanation:
Final answer:
The gate control theory of pain suggests that the competition between touch fibers and pain receptors can prevent pain messages from reaching the brain. Touch activates larger nerve fibers to close the 'gate' to pain. The brain's endorphin release and the descending pain modulatory system also play roles in pain perception.
Explanation:
The theory that suggests that input from touch fibers competes with input from pain receptors, possibly preventing pain messages from reaching the brain, is known as the gate control theory of pain. This theory was proposed by Ronald Melzack and Patrick Wall and posits the presence of a 'gate' in the spinal cord. According to this theory, touch or massage can activate larger nerve fibers which then block the signals from smaller pain fibers, effectively closing the gate to pain and preventing the pain signals from ascending to the brain.
The gate control theory helps to explain why distracting activities or focusing on touch rather than the source of pain can sometimes provide relief. In addition to the gate mechanism, the brain's release of endorphins can also modulate our perception of pain, acting as natural painkillers.
Modern research continues to explore the descending pain modulatory system, which consists of complex brain structures that can influence the perception of pain, demonstrating pain's subjective and multifaceted nature.
How do energy and matter move through an ecosystem?
1.Energy unidirectionally flows through an ecosystem, whereas matter generally cycles within an ecosystem.
2.Both energy and matter cycle within an ecosystem.
3.Matter unidirectionally flows through an ecosystem, whereas energy cycles within an ecosystem.
4.Both energy and matter unidirectionally flow through an ecosystem.
Answer:
1.Energy unidirectionally flows through an ecosystem, whereas matter generally cycles within an ecosystem.
Explanation:
In an ecosystem, energy from the organisms of one trophic level to that of next occurs by the process of feeding. The flow of energy follows a unidirectional path which means that energy from producers is carried to the primary consumers, secondary consumers and so on. It does not flow in reverse direction (from consumers to producers).
On the other hand, matter such as carbon, nitrogen, phosphorus, etc. are cycled via various biogeochemical cycles. For instance, plants intake carbon from the air in the form of CO2 and form organic nutrients. These organic nutrients carry the carbon from plants to herbivores and then to the consumers of higher trophic levels. However, when plants and consumers die, the carbon present in their tissues is decomposed and is released back to the surroundings. In this way, the carbon cycle cycles carbon in an ecosystem.
In an ecosystem, energy flows unidirectionally, starting from the sun to producers, then consumers. On the other hand, matter like carbon, nitrogen, or water is cycled within the ecosystem, passing through various living organisms and the physical environment.
Explanation:In an ecosystem, energy and matter interact in very different ways. Firstly, energy flows unidirectionally through an ecosystem. This means it is transferred from the sun to producers (like plants) in the form of light energy, which these organisms then convert into chemical energy via photosynthesis. Herbivores, or primary consumers, then eat these plants and take in this energy. This energy is subsequently transferred up the food chain as these herbivores are eaten by carnivores, and so on. However, with each transfer, some energy is lost to the environment as heat, making for a one-way flow.
On the other hand, matter cycles within an ecosystem. This encompasses components such as carbon, nitrogen, and water, which are recycled through living organisms and the physical environment. For example, plants absorb carbon dioxide from the atmosphere for photosynthesis. When they are consumed by animals, this carbon is incorporated into their bodies. Once these organisms die and decompose, the carbon is released back into the soil or atmosphere, completing the cycle.
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_________ is the preferred term to use when referring to the direction of a person’s sexual or romantic attraction.
Answer:
Sexual orientation
Explanation:
The sexual orientation is a term that defines the enduring pattern of sexual or romantic attraction of a person towards the opposite sex , same sex, more than one gender or towards both the sex. These are categorized as heterosexuality, homosexuality, bisexuality. The another category includes asexuality that includes lack or no sexual attraction.
The gender and gender identity is different from the sexual orientation. The combination of certain factors like environment, hormones, biological and emotional are responsible for sexual orientation. Most of the individuals are aware about their sexual orientation during adolescence.
With regards to a variation of a physiological value from its set point or normal limit, negative feedback always __________ the value back to the set point or normal limit.
A. returns
B. decreases
C. increases
D. There is not enough information to answer this question.
Answer:
Answer is A. returns.
Explanation:
Negative feedback is a situation where the result , outcome or end product of a system stabilize the input or stimulus of that same system.
Examples of negative feedback homeostasis and blood sugar regulation.
In blood sugar regulation, the glucagon tends to increase or raises the blood glucose when the level is low, while the insulin lower the blood glucose when the level is high.
Negative feedback mechanisms in physiological systems work to return a value back to its set point or normal limit by reversing changes, thereby maintaining stability in the system.
Explanation:In the context of physiological systems, the correct answer to the question would be 'A. returns'. Negative feedback mechanisms work to return a physiological value back to its set point or normal limit. This is because negative feedback systems act to counteract changes and maintain balance in the system. For example, if the body temperature rises, mechanisms such as sweating are initiated to decrease the temperature back to its normal limit. Thus, negative feedback works to maintain stability in a system by reversing any deviations from the set point.
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This human karyotype is unusual because chromosome set
a. 5 has chromosomes of different shapes
b. 10 is missing genetic material
c. 14 has enlarged centromeres
d. 21 has an extra chromosome
Answer:
The correct option is d) 21 has an extra chromosome
Explanation:
The complete array of chromosomes that an individual possesses is known as the karyotype of the individual. Humans have 46 chromosomes which make up 23 pairs.
In the karyotype shown in the picture, the 21st pair has an extra chromosome. Such a condition is known as Down's Syndrome. In such a person, the mental ability of the person is influenced and he usually suffers from mental disabilities. The facial features of such a person also are different.
This human karyotype is unusual because chromosome set 21 has an extra chromosome (option d).
A karyotype is a graphic representation of the individual's collection of chromosomes.In diploid organisms (e.g., humans), each cell receives two homo-logous chromosomes, one from each parent.Human somatic (body) cells contain 46 chromosomes, which are organized into two sets of 22 homo-logous chromosomes and two sex chromosomes (either XX or XY).In conclusion, this human karyotype is unusual because chromosome set 21 has an extra chromosome (option d).
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Multicellular fungi are composed of thread-like structures called , which group together to form mycelia to perform specific functions?
Answer:
The correct answer is- hyphae
Explanation:
Most multicellular fungi form thread-like filaments called hyphae. When these hyphae come together and fuse with each other they form mycelium.
This mycelium makes the body of multicellular fungi and because they are spread to longer distance they help in the absorption of water and nutrients for the fungi.
These mycelia are also responsible for secreting hydrolytic enzymes which play an important role in the decomposition of organic matter which is then absorbed by the fungi. Therefore the correct answer is hyphae.
Fungi are organized into thread-like structures known as hyphae. These hyphae, when grouped, form mycelia which enables fungi to perform various biological functions.
Explanation:
Multicellular fungi are composed of thread-like structures called hyphae, which group together to form mycelia. This organization allows fungi to perform essential tasks and function as a united entity. The grouped structure of the hyphae, the mycelium, is like the root system of the fungi, providing an expanded surface area for nutrient absorption. They play a distinctive role in decomposition and nutrient cycling and perform specific functions like nutrient absorption, reproduction, and growth.
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As a part of his workout regimen, a 21-year-old college football player often engages in squats and lateral arm holds. These are examples of what type of exercise?
a) aerobicb) isotonicc) anaerobicd) isometric
Answer:
The correct answer is- isometric exercise
Explanation:
Isometric exercise also called static strength training which requires contraction of a particular muscle group. In isometric exercise, the joints do not move and the length of the muscle does not change noticeably.
Squat and lateral arm hold are the example of isometric exercise. Isometric exercise improves the strength of a particular muscle or group muscle for example squat helps in building leg muscles.
Therefore if a girl is engaged in squats and lateral arm holds then it is an example of isometric exercise.
Final answer:
The college football player's workout regimen, including squats and lateral arm holds, consists of c) anaerobic and d) isometric exercises designed to increase muscle strength, mass, and endurance, without a significant change in muscle length during the isometric holds.
Explanation:
The college football player engaging in squats and lateral arm holds is primarily performing anaerobic and isometric exercises. Squats entail lifting and lowering the body's weight, which is a form of anaerobic exercise that includes periods of physical exertion and high-intensity, strength-training activities. Meanwhile, lateral arm holds involve maintaining an arm position against resistance without movement, which is an isometric exercise where the muscle tension remains constant despite no change in muscle length.