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coldgirl [10]
3 years ago
5

For evolution to be occurring, natural selection must also be occurring. a. True b. False

Biology
1 answer:
Vlad1618 [11]3 years ago
4 0

Answer: True

Explanation:

Natural selection is a process of emergence of traits in organisms which are useful for their survival and reproduction. These traits are heritable and pass on from the parents to the offsprings. This results in changes occurring in the same species at genetic, physiological and morphological levels. This results in evolution.

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What types of materials are expelled from cells during exocytosis?
alex41 [277]

Large molecules such as hormones materials are expelled from cells during exocytosis

<u>Explanation:</u>

The materials inside the cells are transferred to the outside of the cell and this manner is termed as  Exocytosis. This method is termed as a kind of active transport since it needs energy for this transformation process. One of the major purposes of this process is to discharge trash matters like hormones and proteins.

For a cell to cell transmission and chemical signal messaging these methods are essential. Proteins that are newly generated are transferred to the peak of the plasma membrane by exocytosis. There are three general pathways of exocytosis.

5 0
3 years ago
Mutations rII1 and rII2 are known to fall into the rIIA and rIIB cistrons (genes) respectively. Cells of E. coli B are infected
viktelen [127]

Answer:

the answer is A. E. coli B

Explanation:

The multiplicity of infection (MOI) refers to the ratio between the numbers of viruses used to infect <em>E. coli</em> cells and the numbers of these <em>E. coli </em>cells. Benzer carried out several experiments in order to define the gene in regard to function. Benzer observed that <em>E. coli </em>strains with point mutations could be classified into two (2) complementary classes regarding coinfection using the restrictive strain as the host. With regard to his experiments, Benzer observed that rII1 and rII2 mutants (rapid lysis mutants) are complementary when they produce progeny after coinfect E. coli K (where neither mutant can lyse the host by itself). The rII group of mutants studied by Benzer does not produce plaques on <em>E. coli</em> K strains that carry phage λ (lysogenic for λ), but they produce plaques on <em>E. coli</em> B strains. This study showed that rIIA and rIIB are different genes and/or cistrons in the rII region.

3 0
3 years ago
The glucose-making part of photosynthesis takes place in the _____.
mariarad [96]

Answer:

The correct answer is CHLOROPHYLL

5 0
3 years ago
Which of the following descriptions about RNA is not correct?
gayaneshka [121]

Answer:

The correct answer is option a. "Double-stranded regions of RNA typically take on an B-form right-handed helix".

Explanation:

Most of the native double-stranded DNA is on an B-form right-handed helix, following the structure proposed by Watson and Crick with about 10–10.5 base pairs per turn. However, double-stranded RNA does not follow this structure, and most regions have an A-form structure. The A-form right-handed helix have slightly more base pairs per turn, which makes it 20-25% shorter than B-DNA.

6 0
3 years ago
Which is the best example of competition in a forest ecosystem?
Mrac [35]
D) Blue Jays and Finches nest in the same Oak Trees.

Explanation:

This is an example of competition because two species are for the same thing, in this case, oak trees to nest in.
3 0
3 years ago
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