1.

Which of the following is not correct about the -sheet?

A. A -sheet is a fully extended configuration built up from several spatially adjacent regions of a polypeptide chain
B. Each region involved in forming the -sheet is a -strand
C. The -strand conformation is pleated with main chain backbone zigzagging and side chains positioned on same sides of the sheet
D. -Strands are stabilized by hydrogen bonds between residues of adjacent strands
Answer» D. -Strands are stabilized by hydrogen bonds between residues of adjacent strands


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