The alpha helix and beta pleated sheet of a protein are examples of its
- 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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