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Margarita [4]
4 years ago
8

How are chromosomes best described during the s phase of interphase prior to mitosis?

Biology
1 answer:
Novay_Z [31]4 years ago
6 0
At the beginning of the S phase, the cell’s nucleus has two pairs of each chromosome, one pair member from each parent. Histone proteins surround the long, linear double helix structures at the heart of the chromosome. Replication creates a second linear structure, or chromatid, attached to the original one all along its length by the protein cohesion. The resulting double-chromatid chromosomes will assume the familiar X-shaped appearance when they condense at the start of mitosis, held together by only a globular centromere. Later in mitosis, the centromeres dissolve, freeing the chromatids that then become independent chromosomes that are distributed to each daughter cell.
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Answer:

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Explanation:

Proline is the amino acid which is unique from other amino acids as the side chain of proline is connected which gives it a cyclic structure. Beta turns are the secondary structure found in proteins that helps in the changing of direction of polypeptide chain in the protein.

The amino -acid proline is commonly found in beta turns because the unique cyclic structure of proline suits the beta-turn organization. Glycine is another amino acid that is abundant in beta turn because of its small size.

Therefore the correct answer is b. likely to be found in beta turns.

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