Multiple choice

The level of protein structure represented by the alpha-helix shape is

  1. quaternary

  2. tertiary

  3. secondary

  4. primary
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The alpha-helix is a type of secondary protein structure. Secondary structure refers to local folding patterns stabilized by hydrogen bonds between the backbone amide and carbonyl groups. The alpha-helix and beta-sheet are the two main types of secondary structure. Primary structure is the amino acid sequence, tertiary is overall 3D folding, and quaternary involves multiple polypeptide chains.

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