What is the function of the active site of an enzyme?
(A) It binds with co-factors only.
(B) It contains a special charged place to fit the substrate.
(C) It is responsible for the formation of peptide bonds.
(D) It synthesizes substrates for the enzyme.
Correct Answer: (B) It contains a special charged place to fit the substrate.
Explanation:
The active site is a specific region of an enzyme where the substrate binds.
This region has a unique shape and chemical properties that allow the substrate to fit perfectly.
According to the lock-and-key model, the substrate fits into the enzyme’s active site like a key fits into a lock. This allows the enzyme to catalyze the chemical reaction.
Why other options are incorrect:
(A) Active site does not bind only cofactors; its main role is binding the substrate.
(C) Formation of peptide bonds occurs in ribosomes during protein synthesis, not by enzyme active sites in general.
(D) Enzymes do not synthesize substrates; they only speed up reactions involving substrates.
