Question

Beta () sheets are a type of secondary structure in proteins. A segment of a single chain in an antiparallel sheet has a length of 291 Å. How many residues are in this segment?

Answer 1

In an antiparallel beta sheet secondary structure of proteins, each residue is approximately 3.5 Å apart from its neighbor. By dividing the total length of the chain, which is 291 Å, by 3.5 Å, it can be determined that there are roughly 83 residues in this segment.

Step-by-step explanation:

The question pertains to the number of residues in a segment of an antiparallel beta sheet, a secondary structure in proteins. In an antiparallel beta sheet structure, the distance between two neighboring protein residues is approximately 3.5 Å. Therefore, to determine the number of residues in this segment, you divide the total length of the segment (291 Å) by the distance between residues (3.5 Å).

To do the calculation:

1. 291 Å ÷ 3.5 Å/residue = ~83 residues

So, the segment of the beta sheet has approximately 83 residues.

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