Silk fibers consist of ____ proteins consisting of alternating ____ and ____ or ____ residues.
A) fibroin; glycine; proline; leucine
B) α-keratin; alanine; glycine; serine
C) fibroin; glycine; alanine; threonine
D) β-keratin; cysteine; alanine; proline
E) fibroin; glycine; alanine; serine

Question

Quizplus · Accepted Answer

Silk fibers are predominantly made up of fibroin, which is composed of amino acids such as glycine, alanine, and serine. The repetitive arrangement of these amino acid residues in fibroin creates a crystalline structure that imparts the unique characteristics of silk, such as its strength, flexibility, and lightness. Therefore, the best choice is E, which lists fibroin, glycine, alanine, and serine as the primary components of silk fibers.

Silk Fibers Consist of ____ Proteins Consisting of Alternating ____

Silk Fibers Consist of Proteins Consisting of Alternating