Answer:
Genetic drift
Explanation:
Genetic drift is an evolutionary mechanism that changes the allele frequency by random sampling (by chance). This type of mechanism has the major impact when population is hit by a natural disaster. As a consequence, the population becomes reduced in size and some alleles might be lost (such as that for for orange crests). The genetic variability is decreased.
Answer:
Genetic Drift
Explanation:
Genetic drift is a change in the allelic frequency within a population due to random chance. It is especially apparent within small breeding populations. For example, genetic drift can result in an allele being completely lost from a population by random chance, regardless of whether the allele has any effect on an individual's chance of survival or its reproductive success. (got it right on study island)
Cells of a fungus and an animal were being studied. which of these would be found in both of these cells?
Mitochondria (btw, the exact question is online if you type it in.)
Fungal and animal cells both contain a nucleus, mitochondria, plasma membranes, and ribosomes, despite differences such as the presence of a cell wall in fungal cells containing chitin.
Both fungal and animal cells share several structures despite their differences. Cells of a fungus and an animal both contain a nucleus, where genetic material is stored and cellular activities are regulated. Additionally, both types of cells possess mitochondria, the energy-producing organelles often referred to as the powerhouses of the cell. Both also have plasma membranes that regulate the movement of substances into and out of the cell, although the specific compositions differ, with fungi having ergosterol instead of cholesterol. While fungi do have a cell wall composed of chitin, animals do not possess a cell wall, but instead have an extracellular matrix. Importantly, ribosomes are present in both animal and fungal cells and are responsible for protein synthesis. In summary, the nucleuses, mitochondria, plasma membranes, and ribosomes can be found in both fungal and animal cells.
What happens in a male's body when he enters puberty? The testes start releasing testosterone. The testes start releasing progesterone. The ovaries start releasing testosterone. The ovaries start releasing progesterone.
The testes start releasing testosterone, the first one.
The first choice, the testes start releasing testosterone
1. Which of the following is NOT a characteristic that mining companies look for when determining if an area is worth mining?
a. Rock color
b. Radioactivity
c. Vegetation
d. Magnetism
2. You are a geologist testing to make sure that waste from a nuclear power plant is not leaking into a nearby farmer’s field. You will be testing for unstable, decaying nuclei. What are you testing for and how will you detect it?
a. You will test for radioactivity by using a microscope.
b. You will test for magnetism by using a Geiger counter.
c. You will test for fluorescence by using a barometer.
d. You will test for radioactivity by using a Geiger counter
3. We can use cow dung (feces) as a form of biomass.
a. True
b. False
4. The following equation is balanced correctly. H2 + O2 --> H2O
a. True
b. False
5. Using the periodic table, which of the following is an isotope?
a. Zn – 68
b. Cs - 133
c. Tb – 159
d. C – 12
1. A 2. C 3. A 4. B 5. D
Answer:
1. C Vegetation
2. D Geiger Counter
3. A True
4. B False
Explanation:
1. Rock color, Radioactivity and magnetism are important characteristics to determine the kind of mineralization and if it is economically viable.
2. Geiger Counter is a device that is used to detects alpha, beta or gamma rays through ionization of the radiation
3. 2H2 + O2 = 2H2O + Energy
4. Carbon-12 is an isotope of carbon, carbon-13 and carbon-14 are also the isotopes of carbon
An organelle found in most eukaryotic cells described as "cellular power plants", because their primary function is to convert organic materials into energy in the form of ATP.
Answer:
The cell organelle that is been described in the question is the MITOCHONDRIA.
Explanation:
Mitochondria is a cell organelle that is found in almost all eukaryotic cells, this is because it performs very crucial functions that make energy available to eukaryotic organisms. The last stage of cellular respiration, which is electron transport chain reaction takes place inside the mitochondria and it leads to the generation of ATP, which is the energy currency of the cells. Mitochondrial is often refers to as the power house of cells because of its ability to carry out biochemical reactions that generate ATP. Without mitochondria, cells will not be able to generate energy.
When you consume alcoholic beverages, impairment of your ability to safely operate a motor vehicle begins at the ______ sip of the alcoholic beverages?
Answer: First
Explanation: When you consume alcoholic beverages, impairment of your ability to safely operate a motor vehicle begins at the "FIRST" sip of the alcoholic beverages?
Impairment of the ability to safely operate a motor vehicle begins with the first sip of alcohol, due to its effects on judgment, coordination, and reaction times, critical for driving. The legal BAC limit is 0.08% but impairment starts before this level.
When you consume alcoholic beverages, impairment of your ability to safely operate a motor vehicle begins at the first sip of the alcoholic beverages. Alcohol intoxication affects individuals differently based on a variety of factors including age, sex, body weight, and overall health, but it is important to understand that any amount of alcohol can impair judgment, coordination, and reaction times, all of which are critical for safe driving. The legal limit for Blood Alcohol Concentration (BAC) in most U.S. states is 0.08%, but impairment starts well before reaching this level. Drinking and driving is dangerous and illegal because alcohol significantly increases the risk of accidents.
Which is not a method used in genetic engineering?
A gene is inserted to remove mutated DNA.
A gene is removed.
A gene is inserted to make a mutation inactive.
A synthetic gene is created.
Answer: A synthetic gene is created
Explanation:
All of the other ones are actually affecting the organism. creating a gene could be a step but it is not really a method
The correct answer is A
A DECREASE in the density of a sample of a gas inside a balloon could be caused by A) putting the balloon in the refrigerator. B) taking the balloon outside on a hot day. C) shaping the balloon into the shape of a dog. D) taking the balloon down to the bottom of the ocean.
Answer:
B
Explanation:
When a mass of air is heated it becomes less dense. This is why a hot air balloon rises in the atmosphere. It is also the same reason why hot air rises and the moisture in it condenses to form clouds. The cooler less dense air mass moves downards (in some convection currents fashion) in to replace the hot rising air.
Answer:
B) taking the balloon outside on a hot day.
Explanation:
What structure in the earthworm has a similar function as the human heart? Explain your answer.
Answer:
Aortic arches
Explanation:
Earthworms are grouped in the phylum Annelids and there body is segmented which resemble many little rings attached together. Similarly, earthworms possess circulatory system and circulate there blood through vessels. Thus, there are three (3) vessels that circulate bloods in earthworm which includes: ventral blood vessels, aortic arches and dorsal blood vessels. However, aortic arches functions like human heart thereby having the responsibility to circulate or pump blood into the ventral and dorsal blood vessels. Furthermore, the aortic arches are known to be the main portion of the artery that bends between ascending and descending aorta.
Answer:
aortic arches
Explanation:
An earthworm circulates blood exclusively through vessels. There are three main vessels that supply the blood to organs within the earthworm. These vessels are the aortic arches, dorsal blood vessels, and ventral blood vessels. The aortic arches function like a human heart.
Ice free areas of antarctica where no rain has fallen for all of recorded history
Final answer:
Antarctica, the driest continent on Earth, has ice-free areas with unique ecosystems, despite being largely covered by an ice sheet. It contains 70% of the Earth's fresh water in its ice, with significant implications for global sea levels if melted. The continent's extreme conditions support only temporary human habitation for scientific research.
Explanation:
The inquiry is about ice-free areas of Antarctica where no rain has fallen for all of recorded history. These regions are notable due to Antarctica's status as the driest continent on Earth, with the least average annual precipitation. Despite its icy appearance, it is technically a desert, receiving fewer than ten inches of precipitation per year overall. The continent covers about 98 percent with an ice sheet, and the ice-free areas contribute to a unique ecosystem of mosses and lichens, surviving in harsh conditions.
About 70 percent of the Earth's fresh water is held within the Antarctic ice sheet. If melted, this would raise sea levels considerably, affecting coastal and low-lying areas globally. Interestingly, Antarctica also harbors subglacial lakes, such as Lake Vostok, hidden beneath the ice sheet, potentially housing unknown forms of aquatic life. Despite the extreme cold and dry conditions, research stations dot the continent, supporting scientific exploration but no permanent human inhabitants.
In summary, Antarctica exhibits a complex interplay between its ice-covered landscapes, dry, ice-free zones, and the hidden aquatic ecosystems beneath its ice sheet, reflecting its status as a unique desert environment on a global scale.
Why do fungi and bacteria produce antibiotics
You have discovered a new species of flowering plant in the Amazon rainforest. You look at
it's root tissue under the microscope and observe that each cell has 14 chromosomes. How
many chromosomes would you expect to find in it's eggs or pollen?
A) 28
B) 7
C) 14
D)21
There would be 28 chromosomes
The root tissue under the microscope and observe that each cell has 14 chromosomes and we can expect 7 chromosomes in eggs or pollen.Option D)21 is correct.
What is chromosomes?A chromosome is devised of proteins and DNA organized into genes. A structure is found inside the nucleus of a cell. Each cell normally contains 23 pairs of chromosomes.Chromosomes are structures found in the center (nucleus) of cells that move long pieces of DNA.DNA is defined as the material that holds genes. It is the building block of the human body. Chromosomes contain proteins that help DNA exist in the proper form.Hence, Option D)21 is correct.The root tissue under the microscope and observe that each cell has 14 chromosomes and we can expect 7 chromosomes in eggs or pollen.
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Yellowish structures that serve as an energy reserve are called
Answer:
Lipids
Explanation:
Lipids are called energy reserves. Like carbohydrates, they can provide energy to the body but as readily as carbohydrates do. Lipids are also known as fats. Aside from providing the body with energy, they are also have a protective function. They act as cushions for different parts of the body like the heart. They are found in adipose tissue.
The yellowish structures serving as an energy reserve are fat cells, or adipose tissue. These cells store fat in the form of triglycerides which the body can use for energy. The yellowish color is due to carotenoids from our diets stored in fat cells.
Explanation:The yellowish structures that serve as an energy reserve in organisms are usually fat cells, also known as adipose tissue. Adipose tissue is a specialized connective tissue that consists of lipid-rich cells called adipocytes. These cells store fat in the form of triglycerides, which can be used by the body for energy when needed. It's typically yellowish because of the carotenoids in our diets that are stored in the fat cells.
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Use the drop-down menus to determine which structures of the endocrine system are described below.
BLANK connects the endocrine system to the nervous system
BLANK called the “master gland” of the endocrine system
BLANK secretes a hormone that regulates sleep cycles
BLANK regulates the development and differentiation of T lymphocytes
Answer:
✔ hypothalamus
connects the endocrine system to the nervous system
✔ pituitary gland
called the “master gland” of the endocrine system
✔ pineal gland
secretes a hormone that regulates sleep cycles
✔ thymus
regulates the development and differentiation of T lymphocytes
Explanation:
edge 2022
The endocrine system is made up of endocrine glands. The hypothalamus is the connection between the nervous and endocrine systems. The pituitary gland is the "master gland." The pineal gland secretes melatonin hormone that regulates sleep cycles, and the Thymus gland regulates T lymphocyte development and differentiation.
What is the endocrine gland?Endocrine glands are ductless glands that are responsible for release of hormones directly into the blood.
The endocrine structures have the following functions:
Hypothalamus is the connection between nervous system and the endocrine system.The Pituitary gland is the “master gland”. The pineal gland secretes a hormone called melatonin that regulates sleep cycles.Thymus regulates the development and responsible for differentiation of T lymphocytes.Thus, the option for blank A is hypothalamus, B is pituitary gland, C is pineal gland and D is thymus gland.
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A closed circulatory system is one in which _______________
Answer:
A closed circulatory system is one in which blood flows though a system of blood vessels throughout the body.
If someone is blood type O, then their blood contains antibodies for which antigens?
A. A
B. Neither A nor B
C. B
D. Both A and B
Answer:
Blood type O person will have no antigens on the surface of RBC, but they do contain anti-A and anti-B antibodies in their plasma.
Explanation:
Since there are no antigens on the surface of RBC, they become universal donors. Blood grouping is generally based on two things one is the presence of antigens on the surface of RBC and the other thing is presence of antibodies in plasma. Blood type A person will have A antigens on the surface of RBC and anti-B antibodies in their plasma. That is why they cannot accept blood from blood type B. Vice versa is the case of blood type B. In case of people with blood type AB, they contain both the antigens A and B on RBC surface but do not contain any antibodies. That is why they are called universal acceptors.
Which types of mutation are possible thanks to the redundant nature of the genetic code?
Cancer is a type of harmful mutation.
Who used a compound microscope to see chambers within cork and named them “cells”?
Answer:
Robert Hooke
Explanation:
Robert Hooke used a compound microscope to see chambers within cork and named them "cells."
Robert Hooke, an English scientist, is credited with the discovery of cells and the coining of the term "cells" to describe the microscopic structures he observed in cork under a compound microscope. In 1665, Hooke published his famous book "Micrographia," in which he detailed his observations using a microscope of his own design.
When examining a thin slice of cork under the microscope, Hooke observed a multitude of small, box-like structures with defined boundaries, resembling the cells of a honeycomb. He described these structures as "cells," drawing an analogy to the cells of a monastery, which were small rooms or chambers where monks lived.
Although Hooke's microscope was relatively simple compared to modern microscopes, his work marked a significant milestone in the history of biology and microscopy. His observations of cork cells were the first recorded discovery of cells as basic units of life, even though the cellular nature of living organisms was not fully understood at the time.
Hooke's discovery of cells laid the groundwork for the subsequent development of cell theory, which postulates that all living organisms are composed of cells, cells are the basic structural and functional units of life, and cells arise from pre-existing cells through cell division. Cell theory is now a fundamental principle of biology and has revolutionized our understanding of life and the complexity of living organisms. Hooke's contribution to microscopy and cell biology remains a significant and enduring legacy in the scientific world.
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At a meal, you are served a hamburger with cheese, onions, and beef on a bun. what ingredients represent the most carbohydrates? select all that apply.
the ingredients that have the most carbs, are bread and starches. in hamburger, breadcrumbs or another binding agent, oatmeal, rice etc. are also used to keep the meat from breaking apart.
Answer:
Cheese and Bun
Explanation:
Bun and cheese have more carbs than the other components of the hamburger. Bread has a lot of carbohydrates that are part of starch. Cheese also has some carbohydrates from milk, such as lactose.
Onions also have a certain amount of carbohydrates, but in a very small amount compared to previous ingredients.
Meat sometimes have products derived from starch or other meat-binding compounds, but they do not have a significant amount of carbohydrates.
What are some of the functions of photosystem i and photosystem ii in plants?
Answer:
Photosystem I (PS-I )and photosystem II (PS-II ) are two multi-protein complexes. These complexes contain the pigments used to absorb, harvest and catalyze the photons and light energy in the photosynthetic reactions. The main purpose of photosynthesis reactions to produce high chemical energy compounds.
Photosystem I and II are different from each other because of their absorbing wavelength of light. PS-I absorbs the longer wavelength of light than PS-II.
PS-I plays the major role in the production of high energy carriers ATP and NADPH using light energy (700 nm).
PS-II plays its function in the hydrolysis of water and ATP synthesis using light energy (680 nm).
Photosystem II (PSII) absorbs light energy and uses it to excite and remove electrons from water, causing water to split and release oxygen. The excited electrons are then passed to Photosystem I (PSI), which also absorbs light to re-energize the electrons before they reduce NADP+ into NADPH. Both systems contribute to ATP production and eventually enable glucose synthesis in the Calvin Cycle.
Explanation:The photosystems I and II are crucial components of the photosynthetic process in plants, playing vital roles in the conversion of light energy into chemical energy. Both systems are embedded in the thylakoid membrane of chloroplasts in plants.
Photosystem II (PSII) functions first in the process and its main role is to absorb light energy and use it to excite electrons, which are removed from water molecules, causing them to split and release oxygen. This is known as photolysis.
Following this, the excited electrons are passed along the electron transport chain to Photosystem I (PSI). PSI also absorbs light energy and uses it to re-energize the electrons, before they are used to reduce NADP+ into NADPH. Both PSI and PSII contribute to the production of ATP through chemiosmosis.
Thus, the ultimate products of the light-dependent reactions involving these photosystems are ATP, NADPH and oxygen, which are used in the next stage of photosynthesis, the Calvin Cycle, to produce glucose.
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The map above shows some of Earth's plate tectonic boundaries.
Based on the map, volcanic activity would most likely be found at −
A) Location W
B) Location X
C) Location Y
D) Location Z
Final Answer:
Volcanic activity would most likely be found at Location Y based on Earth's plate tectonic boundaries.
The correct option is C.
Explanation:
Location Y corresponds to the convergence of tectonic plates, specifically a subduction zone where one plate sinks beneath another. Subduction zones are often associated with intense volcanic activity due to the melting of the descending plate as it moves into the Earth's mantle. This melting generates magma that can erupt through volcanoes, creating volcanic activity.
Locations W, X, and Z are not situated along plate boundaries that typically exhibit the intense volcanic activity associated with subduction zones. Location W represents a divergent boundary, X indicates a transform boundary, and Z depicts a convergent boundary with continental collision, but these boundaries are less prone to volcanic activity compared to subduction zones.
So, the correct option is C.
Which of the following is TRUE of species interactions?A) They can act as agents of natural selection.B) The outcome of any species interactions is static through time.C) They do little to affect species distributions.D) They cannot affect species abundance.
Answer:
The answer is A they can act as agents of natural selection. Hope this helps.
Why did scholars and the general public alike refuse to accept Copernicus’s heliocentric model? HELPP
Answer:
Due to the fact that they had believed that the world was the center of the universe and refused to believe otherwise.
Although it was more of a biblical Catholic Church going against the model, the general public was mainly dictated by the Catholic Church. Since this was introduced in a religious period, it was opposed because it basically stated that the scripture was wrong. Scientists also were looked down upon at the moment as their findings would basically instigate that the Church’s teaching was incorrect.
All of the outer planets are much larger than the inner planets.
Answer:
True...
Explanation:
The outer planets are further away, larger and made up mostly of gas. The inner planets (in order of distance from the sun, closest to furthest) are Mercury, Venus, Earth and Mars.
The inner planets are much smaller than the outer planets and because of this have relatively low gravity and were not able to attract large amounts of gas to their atmospheres
Energy must be transformed in ecosystems because _______.
a.
energy cannot be created or destroyed
b.
an organism’s energy must go somewhere
c.
an organism’s energy must come from somewhere
d.
all of the above
Please select the best answer from the choices provided
A
B
C
D
the answer is D. all of the above on edge
If a sound is refracted away from the surface of the earth, this indicates that the A. air is cooler than the ground. B. wind is blowing in the direction of the sound. C. ground is cooling faster than the air. D. air has high humidity.
Answer:
The correct answer is option A, that is, air is cooler than the ground.
Explanation:
Refraction refers to a phenomenon in which there is a modification in the direction of propagation of any wave as a consequence of its mediating at distinct velocities and at distinct points along the wavefront. In case, when a sound from s source is refracted away from the Earth's surface, there is an indication that the air present above is cooler in comparison to the ground making the sound to refract towards the less dense medium.
Answer:
a
Explanation:
Marsupials are found in north america and australia. True or False
Answer:
True
According to UCMP Berkley, the only naturally occurring marsupial in the North America is the opossum (of different varieties).
Australia has a variety of marsupials, including the Tasmanian Devil, wombat, koala, and Red Kangaroo.
A cell with membrane-bound proteins that selectively bind a specific hormone is called the ________ for that hormone
Answer:
target cell
Explanation:
Target cell for a certain hormone is a cell that have hormone receptor specific for that hormone. There are two main types of receptors on target cell:
cell membrane receptors (also called trans membrane receptors)-usually for peptide hormones, such as insulinintracellular receptors (also called nuclear receptors)-usually for steroid hormones, such as testosterone.Hormone binding to the receptor leads to the signal cascade within the cell, which results in cell response.
What is the primary function of the endocrine system
Answer:
To maintain body homeostasis
Explanation:
The endocrine system consists of the endocrine glands that release hormones directly int the blood. Those hormones bind to their receptors on the target cells and thus regulate their function. The major glands are:
pineal gland-releases melatonin, controls sleep cycle
pituitary gland-control growth, blood pressure, thyroid glands and metabolism etc.
pancreas-secretes insulin and glucagon, control of blood sugar levels
ovaries, testes-reproductive role (release female and male hormones)
thyroid gland-controls metabolism and protein synthesis
parathyroid gland-controls Ca levels
hypothalamus-connects nervous and endocrine systems, controls other glands
adrenal glands-release adrenalin and steroid hormones.
The endocrine system functions mainly to control body processes through the production, secretion, and regulation of hormones. These hormones maintain the body's homeostasis and play crucial roles in growth, metabolism, sexual development, digestion, and other bodily processes. The endocrine system works in harmony with the nervous system to adapt to different environmental conditions.
Explanation:The primary function of the endocrine system is to control body processes by production, secretion, and regulation of hormones. These hormones, secreted primarily by endocrine system cells, tissues, and glands such as the pituitary, thyroid, parathyroid, adrenal, pineal glands, and pancreas, serve as chemical 'messengers' that function in cellular activity and maintain the body's homeostasis. They play significant roles in growth, metabolism, sexual development, digestion, regulation of blood glucose levels, and other normal bodily processes.
The endocrine system adapts to specific environments and conditions. For example, in organisms that undergo metamorphosis, the transformation process, like from a tadpole to a frog, is controlled by the endocrine system.
It is noteworthy that the endocrine system and the nervous system work together to maintain homeostasis and adjust physiological activity when external or internal environmental conditions change. Even different body tissues, such as bone, adipose tissue, heart, kidneys, stomach, small intestine, liver, skin, ovaries, and testes have secondary endocrine functions.
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Jasmine wants to know what grizzly bears eat. What would be the best way for her to find out? A. She should ask her math teacher about grizzly bears. B. She should do an experiment with grizzly bears in her school. C. She should observe grizzly bears up close in the wild. D. She should look up information about grizzly bears in a library book.
Answer:
D. she should look up grizzly bears in an informational book from the library
Explanation:
D. is the most logical of the answers so it is D.
The best method for Jasmine to find out what grizzly bears eat is to look up information about them in a library book. This will provide accurate and detailed information about their diet.
Explanation:Jasmine, to find out what grizzly bears eat, the most reliable method would be D. She should look up information about grizzly bears in a library book. While grizzly bears are fascinating, it's important to remember that for safety and ethical reasons, doing an experiment with grizzly bears at school (option B) or observing them up close in the wild (option C), are not fitting approaches. A math teacher (option A) might not have the detailed information you need about the grizzly bears' diet. Library books on the other hand, especially ones about animals or specifically about grizzly bears, will provide accurate and in-depth information on what grizzly bears eat.
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the height of a type of plant is a normal distribution some plants are tall and some are short but most are in between what is most likely true about this trait
The most likely explanation for a continuous trait, like plant height, is that it is controlled by several different genes. Option C is correct
Given that the feature is described as having a normal distribution and a range of heights, it is most likely polygenic, meaning that it is regulated by several genes.
A continuous range of phenotypes results from the interaction of several genetic and environmental variables on the characteristic in a normal distribution.
Therefore, Several different genes control height
The complete option are :
The height of a type of plant is a normal distribution. Some plants are tall and some are short, but most are in between. What is mostly likely true about this trait?
A.) being short is a recessive trait
B.) height is controlled by one gene
C.) several different genes control height
D.) the height is a Mendelian trait