Question

5. Which of the following molecules form complex structures linked by covalent bonds through Lys, HyLys, or His residues? A) Collagen B) Alpha keratin C) Hemoglobin D) Myoglobin E) Beta barrels 6. Which of the following correlates to the classic experiment demonstrating that reduced and denatured RNase A could refold into the native form? A) Disulfide bonds do not stabilize folded proteins B) Reducing agents denature proteins C) 1° structure can determine 3° structure D) Urea cleaves disulfide bonds E) Denaturation does not disrupt protein 2º structure 7. Which of the following is not a characteristic of the triple helix of collagen? A) It is composed of three left handed helices twisted together. B) There is a requirement for glycine every third amino acid residue C) A hydrogen bond forms between the carbonyl oxygen of the nth amino acid residue and the NH group of the (n + 4)th amino acid residue D) Proline and hydroxyproline residues stabilize the helix E) It is right-handed triple helix. 8. Which of the following occurs first when folding a disordered polypeptide chain into a stable protein formation? A) Hydrogen bonding within the backbone B) Association of ordered subunits C) Tertiary structure refinement D) Formation of a high entropy state E) Aggregation of hydrophobic regions in the protein

Answer 1

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Answer 5

Option A is correct

As collagen form complex structures linked by covalent bonds through Lys, HyLys, or His residues.

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