The alpha helix and beta pleated sheet of a protein are examples of its
Correct answer: B. secondary structure
- A. primary structure
- B. secondary structure
- C. tertiary structure
- D. quaternary structure
Explanation
Secondary structure is the regular local folding held together by hydrogen bonds between the backbone carbonyl and amide groups, giving the alpha helix and the beta pleated sheet. Primary structure is only the sequence of amino acids. Tertiary structure is the overall three-dimensional fold of one chain, and quaternary structure appears when two or more chains associate, as in haemoglobin.
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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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