Which type of interactions are responsible for making the a-helix structure stable?
Correct answer: B. Hydrogen bonds between NH of amino acid in one turn with CO of amino acid in adjacent turns
- A. Peptide bonds between -NH2 and CO groups of adjacent carbon chains
- B. Hydrogen bonds between NH of amino acid in one turn with CO of amino acid in adjacent turns
- C. OH group of one amino acid with CO group of other amino acids on the turn
- D. Hydrogen bonds between adjacent amino acids
Explanation
In an alpha-helix, hydrogen bonds form between the carbonyl oxygen (CO) of one amino acid and the amide hydrogen (NH) of an amino acid located four residues ahead in the sequence. These hydrogen bonds contribute significantly to the stability of the alpha-helix structure. So, option B is correct as it accurately describes the hydrogen bonding pattern crucial for stabilising the alpha-helix structure.
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