Answer:
It is possible for large molecules to enter a cell by a process called endocytosis, where a small piece of the cell membrane wraps around the particle and is brought into the cell. If the particle is solid, endocytosis is also called phagocytosis. If fluid droplets are taken in, the processes is called pinocytosis.
Final answer:
Cells use endocytosis to take in large particles that cannot pass through protein channels, which involves the cell membrane engulfing the particle and requires energy.
Explanation:
Cells take in particles that are too big to pass through protein channels via a process called endocytosis. This is an energy-requiring process where the cell membrane engulfs a particle and forms a vesicle around it inside the cell. As the cell membrane wraps around the particle, it eventually pinches off, securing the particle within a newly created vesicle.
There are different types of endocytosis, including phagocytosis (the engulfing of large particles or even other cells), pinocytosis (the ingestion of fluid and small particles), and receptor-mediated endocytosis (where specific molecules are taken in after they bind to receptors on the cell surface). These processes enable cells to intake nutrients, remove waste materials, and interact with their environment in ways that are not possible through protein channels alone due to the size restriction.
The health status of the American population is poor in international comparison, which is evidence that all the spending on medical care cannot compensate for failures in the public health system. True or False
Answer:
rhwrthwrht
Explanation:
wrthwrthrtherjerjetjeyj
One way in which the anabolism of pyrimidine nucleotides differs from that of purine nucleotides is that
a) the pyrimidine ring is assembled before being bonded to the ribose phosphate, whereas the purine ring is bonded to the ribose phosphate as it is formed
b) there is no feedback inhibition in the anabolism of pyrimidine nucleotides, while feedback inhibition is important in the synthesis of purine nucleotides
Answer:
a) the pyrimidine ring is assembled before being bonded to the ribose phosphate, whereas the purine ring is bonded to the ribose phosphate as it is formed
Explanation:
There are two ways for the synthesis of purines and pyrimidines:
de novo synthesis-from basic simple units"recycling" synthesis-reuse of metabolitesPurines are synthesized directly on ribose sugar, in segments.
Pyrimidines are attached to the ribose after the synthesis of the base.
Tom designs bath time toys. Which modification will help him improve the performance of water squirting whales? A) Larger hole B) Harder plastic C) Smaller whale body D) Thicker, more flexible material
The correct modification to improve water squirting whale toys is A) Larger hole, as it would likely increase the flow rate of the water being squirted out based on fluid dynamics principles.
The student asked which modification will help improve the performance of water squirting whales. To enhance the performance of water squirting toys, a key factor to consider is the ease and speed with which water can be expelled from the toy. In the context of fluid dynamics, the size of the outlet where the water is expelled plays a crucial role. A larger hole (option A) at the water expulsion point would likely increase the flow rate of the water being squirted out, provided the force applied is consistent. This is supported by principles such as Bernoulli's equation, which relates the speed of a fluid to its dynamic pressure and cross-sectional area. Therefore, the correct answer is A) Larger hole.
If the codon reads AAU and the anticodon reads UUA, what is the correct amino acid?
Question 9 options:
asparagine
leucine
phenylalanine
lysine
Answer:
Explanation:
Asparagine
Lysozyme is found in tears and saliva. it is a chemical produced by cells in your body and is considered a nonspecific immune defense. lysozyme kills bacteria by attacking their cell walls, making the bacteria more vulnerable. why is lysozyme considered a nonspecific response to infectious agents?
Answer: Because it attacks more than one type of bacteria, if it only attacked one type it would be specific
Explanation:
Lysozyme is a nonspecific immune defense because it doesn't target any specific bacteria. It destroys the cell walls of a broad range of bacteria, acting as a general defense mechanism.
Explanation:Lysozyme is considered a nonspecific response to infectious agents because it doesn't target any specific bacteria, but rather a broad range of them. This means it serves as a general defense mechanism rather than a specialized one. Once it encounters any bacteria, it acts the same way, by destroying the cell walls, regardless of the type of bacteria. Hence, it does not have the ability to differentiate between various kinds of infectious agents.
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Which section of colon is directly before the rectum
Answer:
Sigmoid colon
Explanation:
Colon is the part of the final section of the digestive tract (large intestine). Its main role is water reabsorption and removal of wastes. The sections of the colon are:
cecum and appendix-the begining and the connection with the small intestineascending colon-its role: removes the water and the nutrients and recycle ittransverse colondescending colon-it stores the wastes before their excretionsigmoid colon (s-shaped)-muscular section for the removal of fecesrectum-final elimination of wastes.If an egg rolls out of a nest, a mother greylag goose will retrieve it by nudging it with her beak and head. if researchers remove the egg or substitute a ball during this process, the goose continues to bob her beak and head while she moves back to the nest. explain how and why this behavior occurs.
Answer:
The proximate explanation for this fixed action pattern might be that nudging and rolling released by the sign stimulus of an object outside the nest, and the behavior is carried to completion once initiated. The ultimate explanation might be that ensuring that eggs remain the nest increased the chance of producing health offspring.
The dna that results from replication consists of
Answer: The result of DNA replication is one old chain and one new nucleotides.
Explanation:
DNA replication usually occurs in living organisms and is process that involves the production or synthesis of two identical DNA replicas from old DNA molecule during cell division. Thus, DNA replication usually starts a specific location in the genome and each strands from the original DNA usually serves as template for the synthesis counterpart DNA known as semi-conservatives replication. However, the result of DNA replication is semi-conservatives replication which is made up of one old chain and one new nucleotides.
The methylation state of an individual CpG island:
is fixed; such genes are permanently turned off.is fixed, but this has no effect on whether genes are expressed.can change over time in response to environmental cues, but this has no effect on gene expression.can change over time in response to environmental cues, allowing genes to be turned on or off as needed.is random sometimes the cytosines are methylated and sometimes they're not, but the state is independent of the environment or cell type.
Answer:
can change over time in response to environmental cues, allowing genes to be turned on or off as needed
Explanation:
DNA methylation is a process of gene expression regulation. It involves the methylation (addition of methyl groups) of the DNA which usually repress gene transcription.
CpG islands are DNA sequences rich in C and G nucleotides, in the form of repeating dinucleotides. They are often found within the promotor of the gene. CpG islands (more preciesly citosine in CpG) can be methylated by DNA methyltransferases. That methylation can change te gene expression and this type of regulation is called epigenetics.
The methylation state of a CpG island, influenced by environmental cues, regulates gene expression. Methylated CpG islands usually lead to gene silencing whereas unmethylated ones often result in gene activation. DNA methylation is a mechanism for controlling gene 'on' or 'off' states.
Explanation:The methylation state of an individual CpG island can indeed change over time in response to environmental cues. This change plays a significant role in the regulation of gene expression. When the CpG islands in a gene promoter region are methylated, it generally leads to the gene being turned off or 'silenced'. On the contrary, when the CpG islands are unmethylated, genes are usually active or 'expressed'. However, these methylation patterns are dynamic and subject to change based on signals from the environment and during different stages of development. To put it simply, DNA methylation is one of the ways by which cells control whether genes are 'on' or 'off.'
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Which of the following is an example of a feedback loop in the body?
A.
The pancreas can be endocrine and exocrine.
B.
The nervous system sends a signal to produce hormones.
C.
The body produces adrenaline when a person is scared.
D.
The thyroid gland reverses the action of the parathyroid gland.
The correct answer is D because this helps it maintain homeostasis
The feedback loop is the mechanism of product amplification or inhibition. The thyroid gland switches the activity of the parathyroid gland is an example of the feedback loop.
What is a Feedback loop?The product of the biological reactions enhances the overall reaction system or can inhibit the system reaction. They can be positive and negative feedback loops.
The feedback mechanism checks and regulates homeostasis and thermoregulation of the body. In the human body, the thyroid and the parathyroid gland acts and produces hormones based on the feedback mechanism.
Therefore, option D. production of the thyroid gland inhibits and reverses the action of the parathyroid glands.
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A stickleback fish will attack a fish model as long as the model has red coloring. What animal behavior idea is manifested by this observation?
Answer:
Sign stimulus
Explanation:
Sign stimulus is a stimulus that will always produce the same behavioral response of an organism. In this case, red coloring is a sign stimulus for the fish attack which is its behavioral response.
This type of innate behavior is called Fixed Action Pattern (FAP) because it is always the same (there is usually no variants in the behavioral response actions). If the model is colored differently, there is no behavioral response (attack).
Place the following in order from highest to lowest expected partial pressure oxygen levels.
• Cells of systemic tissues
• Atmospheric air
• Systemic capillaries
• Pulmonary capillaries
• Alveoli of lungs
Final answer:
The expected partial pressure oxygen levels in order from highest to lowest are: Alveoli of lungs, Pulmonary capillaries, Systemic capillaries, Cells of systemic tissues, Atmospheric air.
Explanation:
In terms of expected partial pressure oxygen levels, the order from highest to lowest would be:
Alveoli of lungs - Partial pressure of oxygen in the alveoli is about 104 mm Hg.Pulmonary capillaries - Partial pressure of oxygen in the blood of the capillary is about 40 mm Hg.Systemic capillaries - Partial pressure of oxygen in the systemic tissues is about 40 mm Hg.Cells of systemic tissues - Partial pressure of oxygen in the tissue cells is about 40 mm Hg.Atmospheric air - Partial pressure of oxygen in the atmospheric air is about 21% (not given in mm Hg).Michaela is starting a farm and wants to ensure that the soil will hold enough moisture for her crops. Which strategy would most likely help her to retain soil moisture? 1Points A find a farm with sandy soil B farm an area with a deep soil layer C increase the size of the particles D plant crops with larger seeds
Answer:
A. find a farm with sandy soil
Explanation:
Sandy soil helps keep moisture retention
In order to retain moisture, the farmer must farm an area with a deep soil layer.
Soil refers to the outermost layer of the earth's crust on which plants grow. The soil supports the growth of plants as well as retains moisture for the plants. This moisture is very necessary for plant growth.
However, sandy soil does not retain moisture because it is porous. In order to retain moisture, the farmer must farm an area with a deep soil layer.
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A newly discovered animal reproduces slowly. It has only one offspring each time it reproduces. Which reproductive strategy does this organism use?
A. r-strategy
B. carrying captivity
C. K-strategy
D. endangered(I don't believe this one is the answer)
Answer:
C: K Strategy
Explanation:
The best choice will be C- K strategy because this type of strategy involves greater investment from parents into their offspring. These organisms are mostly higher organisms which reproduce slowly and ensure the maximum survival of their offspring. They compete strongly with other organisms and invest more in their survival by producing fewer quality offspring that have more survival opportunities.
Example of K-selected species include larger mammals (such as primates and horses), birds and larger plants. Unlike their opposite R-selected specie which produce large number of offspring, K selected specie are called in Equilibrium wile R-selected species are called as opportunistic.
Thank you!
A newly discovered animal that reproduces slowly and has only one offspring each time indicates a K-strategy reproductive strategy, where fewer, larger offspring receive more resources and parental care for better survival prospects in stable environments. Hence, the correct option is C.
The newly discovered animal that reproduces slowly and has only one offspring each time it reproduces employs a K-strategy reproductive strategy. This strategy is characterized by having fewer, larger offspring and investing a significant amount of resources and parental care to ensure the survival of each offspring. This is in contrast to the r-strategy, where species reproduce quickly and in large numbers, but with each offspring having a lower probability of survival. K-strategists are often found in stable, predictable environments where populations tend to be close to their carrying capacity, such as elephants, lions, and whales. These species benefit from a close adaptation to the conditions of their environment, leading to long life spans, later breeding, and stable populations close to the carrying capacity (K).
What is the most likely position for the hurricane indicated by the wind readings from the three weather stations shown?
A) 22 degrees north, 79 degrees west
B) 23.5 degrees north, 77 degrees west
C) 25 degrees north, 75 degrees west
D) 25 degrees north, 79 degrees west
Answer: Your answer would be B!
Explanation:
Which of the following statements about metabolic rate is FALSE? Metabolic rate may be measured by determining the rate of oxygen consumption. The metabolic rate per gram of tissue in ectotherms is dependent on external temperature. An organism's overall metabolic rate increases with the animal's mass. The metabolic rate per gram of tissue is greater in endotherms than in ectotherms. The metabolic rate per gram of tissue is greater in large endotherms than in small endotherms.
Answer:
The metabolic rate per gram of tissue is greater in large endotherms than in small endotherms.
Explanation:
Metabolic rate is a measurement of metabolism in animals: how much energy is used per time. Energy used on a daily level is described as basal metabolic rate. Among both, endotherms (maintain their own heat) and ectoterms (depend on external heat) metabolic rate depends on animal's activity, active animals have higher metabolic rate.
Metabolic rate in ectoterms vary with temperature, while in endoterms it does not.
The false statement is: 'The metabolic rate per gram of tissue is greater in large endotherms than in small endotherms'. This is incorrect as smaller endothermic animals have a higher Basal Metabolic Rate (BMR) per body weight than larger ones.
Explanation:The statement that is FALSE about metabolic rate is: 'The metabolic rate per gram of tissue is greater in large endotherms than in small endotherms'. The metabolic rate, or the amount of energy expended over time, is measured in joules, calories, or kilocalories. It's key to distinguish between endothermic and ectothermic organisms. The metabolic rate per gram of tissue in endotherms is generally greater than in ectotherms.
However, endothermic organisms vary based on size. Smaller endothermic animals have a higher Basal Metabolic Rate (BMR) per body weight than larger ones, primarily because smaller animals have a greater surface area for their mass, which leads to faster heat loss and increased energy need to maintain a constant internal temperature.
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Describe why seed dormancy is a valuable adaptation that has helped explain the evolutionary success of seed plants
Seed dormancy allows for a seed to germinate only when the conditions are right to support the germination and growth of the plant. This adaptation, therefore, increases the chances of survival for the plant. Natural selection, which powers evolution, will always favor desirable traits which will be entrenched in a population through successive generations.
DDT (dichlorodiphenyltrichloroethane) is a manmade pesticide that was designed to kill insects that carried diseases. However, the pesticide was found to cause mutations to both body cells and sex cells in other organisms. Because of this, DDT is now banned in most countries around the world.
How are mutations to reproductive cells, or gametes, different than mutations to other cells in the body?
I. Mutations to reproductive cells can be passed on to offspring.
II. Mutations to body cells can be passed on to offspring.
III. Mutations to body cells are more harmful than mutations to reproductive cells.
IV. Mutations to reproductive cells are usually beneficial to offspring.
--
A.
I, II, and III only
B.
II and III only
C.
I, II, III, and IV
D.
I only
Answer:
I. Mutations to reproductive cells can be passed on to offspring.
Explanation:
Option B) Mutations in reproductive cells can be inherited by offspring, while mutations in body cells only affect the individual.
Mutations to reproductive cells, or gametes, are different from mutations to other cells in the body because only mutations to reproductive cells can be passed on to offspring. When mutations occur in somatic cells (non-reproductive cells), they affect only the individual in which they occur and are not inherited by future generations. However, mutations in reproductive cells can be transmitted to offspring during reproduction, potentially leading to genetic disorders or other hereditary traits.
The statement "Only mutations to reproductive cells can be passed on to offspring" accurately reflects this distinction. The other options presented are not accurate representations of the differences between mutations in reproductive cells and mutations in other cells in the body.
Complete Question:
The pesticide DDT was widely used in the 1940s as a method of insect control. In the late 1950s the first DDT-resistant mosquitoes were discovered, and eventually DDT-resistant mosquitoes were found globally. When DDT is used now, the development of DDT resistance in mosquito populations occurs in months rather than years.
Which of the following best explains the observations concerning DDT resistance in mosquitoes?
A. Competition for limited resources causes mosquitoes to migrate to geographical areas that have richer supplies of DDT
B. The proportion of DDT-resistant mosquitoes in a population remains constant due to the metabolic costs of DDT utilization
C. Natural selection favors DDT-resistant mosquitoes that are already present in a population when DDT exposure occurs
D. DDT is a chemical signal that delays normal reproductive cycles in many mosquito populations
Answer:
C. Natural selection favors DDT-resistant mosquitoes that are already present in a population when DDT exposure occurs
Explanation:
Natural selection is evolutionary mechanism which favours traits of an organism that help them survive and reproduce. In the example, above, DDT resistant mosquitoes will survive after the use of pesticide. The mutation that lead to the resistance is favourable by natural selection.
How does a pluripotent cell differ from a totipotent cell?
A. Pluripotent cells disappear after a baby is born.
B. Pluripotent cells can be used in adults but not children.
C. Pluripotent cells can only turn into one kind of specialization.
D. Pluripotent cells can't give rise to placental cells.
Answer:
D. Pluripotent cells can't give rise to placental cells.
Explanation:
Stem cells are the cells which have the ability to divide and differentiate into many types of cell and at the same time get self renewed.Pluripotent stem cells are a category of stem cells that have the ability to form all the cells except the placental cells and the embryo.The stem cells that can from the placenta and give rise to the embryo are known as totipotent cells.How many pairs of chromosomes do humans have?
Answer:
23 pairs
Explanation:
Combinatorial control refers to a regulatory mechanism in which:each alternatively spliced transcript has a different combination of exons.None of the answer options is correct.transcription is terminated by a combination of sites in the terminator.transcription is initiated by a combination of sites in the promoter.transcription requires a specific combination of transcription factors.
Answer:
transcription requires a specific combination of transcription factors
Explanation:
Combinatorial control refers to a regulatory mechanism in eukaryotic transcription that involves several transcriptional factors. Simply saying, in eukaryotes, expression of a gene is controlled by specific combinations of transcriptional factors. This also means that one factor can be involved in regulation of two distinct genes but in combination with different other factors.
Combinatorial control is one of the examples which shows the complexity of gene regulation in eukaryotes over the prokaryotes.
Ddt is harmful to the environment because it
What do you mean with “ddt” ?
In the late 1960s, carroll williams and karel salma discovered that the insect pyrrhocoris apterus, when grown in jars with paper towels made from balsam fir, underwent several extra larval molts and finally died without completing metamorphosis. further investigation led to the conclusion that the fir trees synthesize a hormonal analog that acts as an insecticide. which hormone is this natural insecticide mimicking?
I don’t know what the answer is I wish I could help
Consider this animal cell. Which organelles are labeled G? a) centrioles b)lysosomes c)endoplasmic d)reticulum-mitochondria
The organelles are labeled as reticulum-mitochondria.
What are organelles?Inside cells, organelles were specialized structures that carry out a variety of tasks. Literally, the phrase refers to "tiny organs." Organelles provide specialized functions to keep a cell alive, much like organs like the heart, liver, stomach, as well as kidneys, which serve different functions to keep an individual alive.
What are mitochondria?The majority of eukaryotic creatures contain a double-membrane-bound organelle known as a mitochondrion. The majority of the cell's adenosine triphosphate, which is being used as a source of chemical energy all across the cell, has been produced by mitochondria using aerobic respiration.
Therefore, the organelles are labeled as reticulum-mitochondria.
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After a major forest fire, the process of succession begins in an ecosystem.
Which best describes how succession changes the ecosystem?
O
A. The ecosystem becomes more stable and diverse.
O
B. The ecosystem becomes more disturbed.
O
C. The ecosystem has fewer species.
O
D. The ecosystem has less biodiversity.
SUBMIT
Answer:
The ecosystem becomes more stable and diverse.- A.
The best answer is:A. The ecosystem becomes more stable and diverse.
As the process of succession occurs, the ecosystem becomes more stable and diverse. This is because different species colonize the area at different stages of succession, leading to an increase in the number and diversity of species present.
Thus, While succession can be seen as a disturbance in the short term, in the long term, it leads to greater stability and biodiversity in the ecosystem. Therefore, options B, C, and D are not correct.
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How many chromosomes are found in human gametes
Answer: Humans have 23
Mendel imagined that seed color in pea plants is influenced by a gene with two alleles in which the allele for yellow seeds (y) is dominant over the allele for green seeds (y). what would mendel predict the seed colors would be from a cross of a male plant with the mixed yy genotype with a female plant with the yy genotype?
Final answer:
Mendel's prediction for the offspring's seed color from a cross between a heterozygous yellow (Yy) and a homozygous green (yy) pea plant would result in a 1:1 ratio of yellow to green seeds, with 50% being heterozygous yellow (Yy) and 50% being homozygous green (yy).
Explanation:
Gregor Mendel imagined that seed color in pea plants is influenced by a gene with two alleles, with the allele for yellow seeds (Y) being dominant over the allele for green seeds (y). When crossing a male plant with a heterozygous genotype (Yy) with a female plant with a homozygous recessive genotype (yy), Mendel would predict the following possible genotypes in their offspring: Yy and yy.
Using a Punnett square to predict this cross's outcome, the resulting genotypes in the F₁ generation would be a 1:1 ratio of heterozygous yellow (Yy):homozygous green (yy). Phenotypically, this would lead to a 50% chance of offspring with yellow seeds and a 50% chance of offspring with green seeds. This principle follows Mendel’s law of segregation, stating that the alleles for a trait separate during gamete formation and recombine at fertilization, producing varying genotypes and phenotypes in the offspring.
Which of the following is the best example of an abiotic factor limiting population size?
A) the amount of aquatic plants eaten by snails in a pond
B) the number of dead standing trees available as nesting sites for downy woodpeckers
C) the spread of deadly human flu virus from one person to another by touching and sneezing
D) the frequency of rainfall needed for the germination of desert plant seeds
Answer:
D) the frequency of rainfall needed for the germination of desert plant seeds
Explanation:
When we talk about abiotic factors, we refer to the non-living factors. The abiotic components of an ecosystem include: Water, air, temperature, light, and the like.
So if we consider it as a limiting factor to population size, this should be the cause of the limitation.
Among all the choices, only D, shows an abiotic factor being the cause of population limiting. Rainfall is an abiotic factor (water), which influences the germination of desert plant seeds, specifically, it depends on the frequency of rainfall.
The theory that too much money in the economy causes inflation is referred to as the
Answer:
Classical inflation theory, also known as quantitative theory of money.
Explanation:
In economics, several theories try to explain what generates inflation. One is the quantitative theory of money. Also called the classical theory, the quantitative theory of money is associated with a strand of economists called monetarists.
The quantitative theory of money relates to inflation the amount of money in an economy. According to theory, the amount of money available determines the price level in an economy. And in turn, the growth rate of the amount of money determines the rate of inflation.
Within this view, there is a balance between money supply and demand in an economy at a given productive level. If there is a change in this supply and demand for money without changes in the productive capacity of this economy there will be a price change.