Which of the following structural proteins is correctly paired with the modified amino acid or cross-link that is an integral part of that protein?
A)collagen: 5-hydroxylysine
B)elastin: hydroxyproline
C)$\alpha$-keratin: cross link formed by oxidation of lysine, then aldol condensation
D)collagen: desmosine
E)fibroin: cross-link formed by dehydration of serine residues

Question

Quizplus · Accepted Answer

Collagen is correctly paired with 5-hydroxylysine, which is a modified amino acid integral to its structure. Elastin is actually correctly paired with desmosine, not hydroxyproline. F1F1F1S1F1F1F10-keratin is a made-up protein and is not a correct pairing. Fibroin is correctly paired with a cross-link formed by dehydration of serine residues, but it is not one of the options given.

Which of the Following Structural Proteins Is Correctly Paired with the Modified