The given diagram shows the structure of a protein. In the labelled region X, the type of secondary structure and the type of bond that stabilizes the secondary structure are
Correct answer: B. B
- A. A
- B. B
- C. C
- D. D
Explanation
The alpha helix is the secondary structure labelled as X, characterized by a right-handed coiled or spiral conformation. It is stabilized by hydrogen bonds between the carbonyl oxygen of one amino acid and the amide hydrogen of an amino acid four residues earlier in the sequence. So option B is correct. All other options give incorrect combinations.
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About Proteins
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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