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Evolutionary advantages. Lactase persistence is a text-book example of natural selection in humans: it has been reported to present stronger selection pressure than any other known human gene. However, the specific reasons as to why lactase persistence confers a selective advantage "remain open to speculation".
WHAT THEY DO IN HUMAN BODY?Lactase breaks down the lactose in food so your body can absorb it. People who are lactose intolerant have unpleasant symptoms after eating or drinking milk or milk products. These symptoms include bloating, diarrhea, and gas. Lactose intolerance is not the same thing as having a food allergy to milk.
In pastoralist populations, individuals with the lactase-persistence mutations were more likely to survive, reproduce, and pass on their alleles than people without the mutations, especially in times of famine.
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Hope It Helps!
One choice contains ONLY biotic factors that might be found in a home aquarium's environment. That is
A)
fish, snail, and plants.
B)
fish, snail, and gravel.
water, gravel, and the glass wall of the aquarium.
D)
fish, dissolved oxygen, and bacteria living in the water.
Answer:
A) fish, snail, and plants
Explanation:
What is the relationship between Rate of Enzyme Reaction and temperature?
Like most chemical reactions, the rate of an enzyme-catalyzed reaction increases as the temperature is raised. A ten degree Centigrade rise in temperature will increase the activity of most enzymes by 50 to 100%.
If a cell lost the ability to make its own proteins what organelle is likely not working properly?
A. Ribosomes
b. Cell membrane
C. Chloroplast
D. Mitochondria
Answer:
A: Ribosomes -
They are composed of special proteins and nucleic acids.
Explanation:
B is incorrect, because the cell membrane controls what goes in and out of the cell.
C is incorrect, because chloroplast helps with photosynthesis in plant cells
D is incorrect. because mitochondria is the power house of ther cell. It produces the energy for the cell.
4. What role do carrier proteins play in facilitated
diffusion?
Answer:
Carrier proteins can change their shape to move a target molecule from one side of the membrane to the other. ... The carrier proteins involved in facilitated diffusion simply provide hydrophilic molecules with a way to move down an existing concentration gradient (rather than acting as pumps).
What is this organelle
how to solve Amino Acid Sequence?
Answer:
I hope this helps it's a picture of how to solve to get amino acids.
Explanation:
1. What are the six kingdoms in the six-kingdom
system of classification?
2. What are two things that make archaebacteria
difficult to study?
3. What is the most heterogeneous kingdom in
terms of morphology?
4. What is the difference between a kingdom and a
domain?
PLEASE HELP NEED ANSWER AS SOON AS POSSIBLE
Match the terms related to enzyme actions with their descriptions.
substrate
active site
product
catalyst
the initial substance in a chemical
reaction that is changed
the substance that speeds up or helps
chemical reactions to occur
the location on an enzyme where
the initial substance reacts
the end substance that results from
a chemical reaction
Answer:1:reactants
2:catalyst
3:active site
4:product
Explanation: U answer my question plz
Rough-skinned newts produce a strong toxin called TTX as a defense mechanism against predators. Garter snakes can
tolerate a very limited amount of the toxin. However, several populations of garter snakes have recently shown an
increased tolerance for TTX. The different populations of snakes have independently acquired a gene variation that
allows them to better block the effects of the toxin.
Jason P ROSS/Dreamstime
Rough-skinned newt
Garter snake
Which of these is most likely to increase in garter snakes?
Answer: C
Explanation: took the testy test
The most likely to increase in garter snakes is :
C) The frequency of the variant gene in the garter snake population.
"Garter snakes"The most likely to increase in garter snakes is the frequency of the variant gene in the garter snake population.
The garter snakes are common, harmless North American snake that typically has well-defined longitudinal stripes and favors damp habitats.
Thus, the correct answer is C.
Learn more about "Garter Snake":
https://brainly.com/question/24585762?referrer=searchResults
What’s the different properties of hbA and HbS
Answer:
The isoelectric point of normal HbA is 6.9 [91], but HbS has two fewer negative charges per hemoglobin molecule than HbA because glutamic acid residues in the β-chains of HbS were substituted by the valine residues [5], [6]. It shows that HbS has more hydrophobicity than HbA in this condition [10]
What is one job of RNA?
carrying genetic information
manufacturing nucleotides
giving shape to chromosomes
unraveling DNA
Answer:
carring genetic information
Explanation:
What is the coding region of DNA called? Explain.
a- A gamete
b- A allele
c- A sister chromatid
d- A gene
Answer:
D-Gene
Explanation:
Because of the protein it get's. When it gets the protein it needs then they develop the gene therapy.
a unicellular organism splits into two parts during
Answer:
fission
Explanation
Where does asexual reproduction take place? When single-celled organisms (like bacteria and protozoa) just split (or break) into two identical halves during cell division, leading to the creation of new organisms is called fission.
Hope fully this is correct.
Answer:
amorba
Explanation:
unicelluler organism that splits
(_______) stars, however, will last for several billion years, because
they burn their fuel much more slowly. *
Answer:
Smaller
Explanation:
Life Cycle of a Star
Stars are formed in clouds of gas and dust, known as nebulae. Nuclear reactions at the centre (or core) of stars provides enough energy to make them shine brightly for many years. The exact lifetime of a star depends very much on its size. Very large, massive stars burn their fuel much faster than smaller stars and may only last a few hundred thousand years. Smaller stars, however, will last for several billion years, because they burn their fuel much more slowly.
Biology questions
if you only know the answer to one that's ok I just need some help
1. Which digestive enzyme is made in the Mouth? How does it help digestion?
2. What digestive enzyme is made in the Stomach? How does it help digestion?
3. What other chemical is made in the Stomach? How does this help digestion?
4. What does the Pancreas make that helps to neutralize the acid from the stomach as it goes into the small intestine?
5. What enzymes make up Pancreatic Juice? What does each enzyme do to help digestion?
6. What chemical does the liver make? What does it do?
7. What does the gall bladder store?
Answer:
1. Salivary amylase is the primary digestive enzyme in the mouth. I helps to break down carbohydrates.
2. Pepsin is produced in the stomach and breaks down proteins.
3. Protease is also found in the stomach. It breaks down proteins and peptides.
4. Bicarbonate is a basic substance made by the pancreas and helps to neutralize stomach acid.
5. Bicarbonate ions to neutralize the hydrochloric acid of chyme.
6. The liver secretes bile, a digestive fluid; metabolizes proteins, carbohydrates, and fats; stores glycogen, vitamins, and other substances; synthesizes blood-clotting factors; removes wastes and toxic matter from the blood; regulates blood volume; and destroys old red blood cells.
7. Bile
Explanation:
Large deposits of bones
physical records
both Bible and physical records
Bible account
How do the profile plot amplitudes of all three muscle types (skeletal, cardiac and smooth muscle) compare?
This is a map of a _ landform because ?
ASAP
Answer:
This is a map of a Mountain landform because the rings get smaller until the top of the mountain. Also the altitude goes up until it reaches the top.
Explanation:
All living things are classified into kingdoms based on specific characteristics. Which of the following are only characteristic of the plant kingdom?
Answer:
divided into phylaits is the biggest group of living thingsAnswer:
autotrophic, eukaryotic cells, cell wall present
Explanation:
On a scale of one to nature valley granola bar, how much is your life falling apart rn?
Answer:
Nature valley granola bar lol
Explanation:
Answer:
Nature Valley Granola bar.
Explanation:
I can't see my future wife (whom I had gotten engaged to before the pandemic started) because she became infected with the corona virus. Not to mention several of my friends that I had known since High School have died. So life really isn't going well right now.
HELP PLEASEEE ASAP————————
Answer:
U already marked the correct option.
Anna studies the color of her bedroom wall using different lights. In sunlight, she sees that the wall is white. Anna darkens the room and shines a beam of light that includes all the wavelengths of visible light onto the wall. In this light, what's the wall color that Anna sees?
Answer:
White
Explanation:
The light is measured by its wavelength, generally in nanometers (nm), and visible light has a wavelength spectrum of 400 to 700 nm. Sunlight can be divided into three components: 1-visible light, 2-ultraviolet (UV) light, and 3-infrared radiation. Since white light is visible light (this color contains all the colors of the rainbow) and sunlight includes the visible light of all wavelengths, the object will look white under this light spectrum.
Answer:
white
Explanation:
When an object does not move it is because there are unbalanced forces acting on it. please help!
A. True
B. False
Answer:
I think that the answer is False.
Explanation:
Which situation is an example of competition that could be found in the ocean?
two shark populations utilize the same fish population as their main food source
algae blooms decrease as the number of fish increase
lack of sunlight due to changes in the seasons restricts the growth of certain plants
plentiful oxygen leads to an increase in the number of reefs
Answer:
A. two shark populations utilize the same fish population as their main food source
I'm guessing this is from Marine Biology. I know this is an example of competition because two different groups of sharks are eating food from the same source. If one group gets to it first every time, they could leave the other group with no food. So it is a competition.
Answer:
two shark populations utilize the same fish population as their main food source
Explanation:
I took the test bestie <3
Gametes in humans are
a. Sperm cells
b. Egg cells
c. Sperm or egg cells
d. X or Y chromosomes
Answer:
c
Explanation:
they are also known as sex cells
Answer:
Sex Cells (Sperm & Egg Cells)
Identify which type of natural selection is described in each case below.
Results in the evolution of the species:
Results in new species:
Favors traits at the two extremes:
No increase in diversity:
One extreme trait is favored:
Diversity decreases:
Diversity increases:
Answer:
Results in the evolution of the species: Directional selection
Results in new species: Disruptive selection
Favors traits at the two extremes: Disruptive selection
No increase in diversity: Directional selection
One extreme trait is favored: Directional selection
Diversity decreases: Stabilizing selection
Diversity increases: Disruptive selection
Explanation:
Directional selection which is also known as positive selection is known to be a mode of natural selection. In this type of selection, an extreme phenotype is favored over other phenotypes. This makes the allele frequency to move in the direction of that phenotype and this takes place over time.
Disruptive selection (known to be diversifying selection) talks about the certain changes in the population genetics whereby extreme values of a particular trait are favored over intermediate values. This results in new species.
While Stabilizing selection is a natural selection whereby there is a stabilization of the population mean on the particular value of a non-extreme trait. Here the diversity is decreases.
Answer: A) directional selection
B) disruptive selection
B) disruptive selection
A) directional selection
A) directional selection
C) stabilizing selection
B) disruptive selection
Explanation: :)
10 POINTS (and no its not 5 and I gave 10 its 10 and I gave 20)
In the Northern Hemisphere, winds associated with a high-pressure system blow
clockwise toward the center
clockwise outward from the center
counterclockwise outward from the center
counterclockwise toward the center
Answer:
Low pressure is called a cyclone and has anticlockwise winds blowing around it. High pressure is called an anticyclone and has clockwise winds blowing around it. I mean the second one.
Answer:
a. clockwise toward the center
Explanation:
Because the winds differ on every side of earth.
starch is a polysaccharide that contains...
A. one molecule of glucose
B. two molecules of glucose
C. many molecules of glucose
D. none of the above
HELP
Answer:
many molecules of glucose
HELP DUE IN 10 MINS!
In leaves of a plant, Solar Energy is first used to make??
A. Proteins
B. Carbohydrates
C. Lipids
D. Water
Answer:B is the right answer I am sure.
Explanation:
Answer:
B. Carbohydrates
Explanation:
I have already done this unit
compare and contrast animal cells, plants cells and prokaryotic cells