Question

A ______ is a portion of the polypeptide chain that is almost fully extended having a zig-zag pattern?

1) Alpha helix
2) Beta sheet
3) Random coil
4) Turn

Answer 1

Answer: Beta sheet

Explanation Beta sheets are composed of two or more extended polypeptide chains called β-strands that run alongside each other. They can be arranged in either a parallel or antiparallel manner. The residues arrange themselves in a regular zigzag manner with the adjacent peptide bonds pointing in opposite directions.

I hope this helps! Sorry if it is wrong or if it is not what you are looking for. :(

Answer 2

A beta sheet is a portion of the polypeptide chain that is almost fully extended and has a zig-zag pattern. It consists of multiple chains that run parallel or antiparallel to each other, forming a pleated shape.

Step-by-step explanation:

A ​beta sheet​ is a portion of the polypeptide chain that is almost fully extended having a zig-zag pattern. In a beta sheet, multiple chains run parallel or antiparallel to each other, forming a pleated shape. The neighboring chains may be different polypeptides or the same polypeptide chain with hairclip-like bends at the ends.