Question

Two polypeptide chains are joined by hydrogen bonds to produce

• A. $\alpha$-helix
• B. Tertiary structure
• C. $\beta$-pleated sheet
• D. All of the above

Answer 1

The correct option is C $\beta$-pleated sheet

Protein is formed by the amino acids which are linked together by peptide bonds.

β-pleated secondary protein structure is formed by the parallel or anti-parallel polypeptide chain linked together by H - bonds. It is stabilized by the hydrogen bonds formed between NH and Co of the adjacent polypeptide chain. The distance between the adjacent amino acids are 3.5 A${}^o$.

So, the correct answer is option C.