Discussion
Which of these describes the secondary structure of a protein?
Answer: B
Secondary structure is the alpha helix and the beta pleated sheet.
These are local, regular foldings of the polypeptide backbone, held by hydrogen bonds between the carbonyl oxygen of one residue and the amide hydrogen of another. The primary structure is the amino-acid sequence, the tertiary the overall fold of one chain, and the quaternary the assembly of several chains.
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