Question

is a right - handed coil. the beta sheet can form in between two or more segments of the polypeptide chain lying side by side. the entire folded protein 3d structure is known as the tertiary structure.
the main two secondary structures of proteins are alpha helix and beta sheet which are represented respectively by which two letters in the image?
a) a and c
b) a and b
c) b and c
d) b and a

Explanation:

In protein secondary - structure nomenclature, the alpha - helix is commonly represented by the letter 'A' and the beta - sheet by the letter 'B'.

Answer:

B. A and B