Question

β-sheets are present in the pure form in? 1.silk fibroin 2.α-keratin 3.collagen 4.none of the plz give the answer with explanation..

Answer 1

Answer:

silk fibroin

Explanation:

Primary level of protein structure: The protein fibroin in silk has a repeating sequence of amino acids : mostly Gly-Ser-Gly-Ala-Gly-Ala, extending in length to over 5000 residues.

Secondary level of protein structure: These amino acids have small R groups, so the side chains fit together easily and allow many long straight parallel fibres to be formed, each facing in the opposite direction to the ones above and below, forming a beta pleated sheet .