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nevsk [136]
3 years ago
9

What are the mechanisms of microevolution

Biology
1 answer:
prohojiy [21]3 years ago
7 0

Answer:

Mutation, migration, genetic drift, and natural selection are all processes that can directly affect gene frequencies in a population.

Explanation:

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In the human body, sodium—a component of salt—balances fluids, such as water, in the body. Explain how the onion experiment show
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Answer:

The salt worked like sodium on the onion.

Explanation:

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2 years ago
The lactose (lac) operon in E. coli is an example of a repressed gene when lactose is not available in a cell. In 3-5 sentences
irakobra [83]

Answer:

Please find the detailed explanation of this statement below

Explanation:

Firstly, a repressed gene is a gene whose expression has been inhibited or repressed. The lac operon in E.coli bacteria is a regulatory unit containing structural genes, a single promoter and operator regions. The promoter is the region where the transcription enzyme (RNA polymerase) binds to in order to transcribe the genes in the lac operon. The structural genes in the lac operon can only be expressed in the presence of lactose sugar.

However, in the absence of lactose, LAC REPRESSOR, which is a transcription factor (protein), prevents the binding of RNA polymerase to the PROMOTER region by binding to the OPERATOR region of the lac operon. This inhibits the expression of the lactose genes in the operon.

Note that, the structural genes in the lac operon (lacZ, lacY, lacA) code for proteins that help break down lactose sugar for energy in the E.coli bacteria. Therefore, a bacteria cell with a repressed lac operon will be unable to degrade lactose sugar.

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3 years ago
A bunsen burner is used for heating in a laboratory. Which safety procedure is important to follow when using a Bunsen burner? A
SVETLANKA909090 [29]
The answer should be B
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Which of these is true for a daughter cell produced by mitosis?
cluponka [151]

The answer is A

Mitosis creates two identical daughter cells that each contain the same number of chromosomes as their parent cell. In contrast, meiosis gives rise to four unique daughter cells, each of which has half the number of chromosomes as the parent cell.

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2 years ago
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An amoeba is a unicellular organism, which doesn’t have a stomach for digestion of food. How does food storage and digestion tak
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Food storage and digestion take place inside a food vacuole in the cytoplasm of amoeba.<span> Once digested, it reaches each cell organelle.</span>
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