Question

Serine proteases are called so because they

• A. They require serine for their activity
• B. cleave after serine residues in the substate
• C. Are inhibited by the presence of free serine
• D. Have a serine residue at their active sire

Answer 1

The correct option is A They require serine for their activity

Serine proteases are enzymes that cleave peptide bonds in proteins, in which serine serves as a nucleophilic amino acid at enzyme's active site. Serine proteases are responsible for coordinating various physiological functions including digestion, immune response, blood coagulation, and reproduction. Hence, serine proteases are called so because they require serine for their activity.

So, the correct answer is 'They require serine for their activity'.