Multiple choice

The protein structure defining the protein molecule in 3d is

  1. Quaternary structure

  2. Ternary structure

  3. Secondary structure

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

One of the main conformational parameter of the amino acid structure is the value of the PHI and PSI angles. These angles completely define the conformation of the polypeptide chain. With some special values for these angles the main chain can adopt specially classified conformations, like alpha-helix or beta-strand. The other main feature of the protein secondary structure is the local stabilisation by hydrogen bonds. These conformations are classified as a protein secondary structure.

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