Multiple choice

Collagen, $\alpha$-keratin and tropomyosin have common structural features. They are (P) disulfide bridges to neighboring proteins. (Q) repeating sequences of amino acids (R) a high 3-sheet content (S) superhelical coiling

  1. P, Q

  2. Q, R

  3. Q, S

  4. P, R
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Collagen, alpha-keratin, and tropomyosin are all fibrous structural proteins characterized by repeating amino acid sequences and a coiled-coil or superhelical structural motif. They do not share high beta-sheet content, as collagen is a triple helix of polyproline II-like helices and keratin and tropomyosin are primarily alpha-helical.

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