The structure of hemoglobin contains ......... heme groups.

Assertion : The amino acid glycine comes under the category of nonessential amino acids.
Reason : This is due to the fact that it can not be synthesised in the body.

Which of the following is least likely to be involved in stabilizing the three-dimensional folding of a protein?

In the structure of a protein,which groups are responsible for the $N$-terminal and $C$-terminal,respectively?

The number of disulphide linkages present in insulin is

In the human body,the synthesis of non-essential amino acids occurs during: