When a protein has alpha-helical structure, how many amino acid residues are there per turn of the helix?
A) 2.6
B) 3.2
C) 3.6
D) 4.2
E) none of the above

Question

Quizplus · Accepted Answer

In an alpha-helical structure, there are approximately 3.6 amino acid residues per turn of the helix. This value may vary slightly depending on the size and chemical nature of the amino acids present in the protein. Therefore, the best choice is C) 3.6.

When a Protein Has Alpha-Helical Structure, How Many Amino Acid