Which of the following holds the alpha helix of protein in its place:
Correct answer: D. Hydrogen bond
- A. R group
- B. Disulfide bond
- C. Amino group
- D. Hydrogen bond
Explanation
The α-helix is a right-handed helix with the peptide bonds present on the inside and the side chains extending outward. It is stabilized by the regular formation of hydrogen bonds parallel to the axis of the helix; they are formed between the amino and carbonyl groups of every fourth peptide bond.
This question appeared on the UHS MDCAT 2018 paper, which you can sit online with every answer explained.
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Proteins are polymers of amino acids joined by peptide bonds, and their function depends on primary, secondary, tertiary and quaternary structure. The topic covers fibrous and globular proteins, enzymes, antibodies, hormones and transport proteins, as well as denaturation by heat or extreme pH.
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