Question

In $\alpha$-helix secondary structure, hydrogen bonds lie between imide group of one amino acid and carbonyl group of

• A. 2${}^{nd}$ amino acid
• B. 3${}^{rd}$ amino acid
• C. 4${}^{th}$ amino acid
• D. 5${}^{th}$ amino acid

Answer 1

The correct option is C 4${}^{th}$ amino acid

Alpha helix structure of the protein is a form of a secondary structure of the protein. It is formed due to the formation of hydrogen bonds between backbone amide and carbonyl groups. The hydrogen bond linkage is formed between N-H group of one amino residue with a C=O group of another amino acid, which is placed in 4 residues earlier. Each turn of alpha helix contains 3.6 amino acid residue.

So, the correct answer is option C.