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Example Question #21 : Secondary Structure
Which of the following are true of beta sheet structures in a protein?
I. Beta sheets are formed by one or multiple polypeptide chains.
II. Beta sheets are secondary structures in proteins.
III. In a beta sheet, polypeptide strands can be parallel or antiparallel.
IV. In beta sheets hydrogen bonds connect polypeptide chains.
Possible Answers:
II and III
I, II, III, and IV
III and IV
I, II, and III
I and II
Correct answer:
I, II, III, and IV
Explanation:
A beta sheet (a secondary structure) has parallel strands when the N-terminal and C-terminal are in the same orientation for all the strands. When the orientation alternates between beta strands they are considered to be anti-parallel. Hydrogen bonds stabilize the structure between polypeptide strands.
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