Question

a molecule to which an enzyme binds and upon which it acts is a:

• cofactor.
• substrate.
• substrate and template.
• template and cofactor.
• template.

Explanation:

An enzyme binds to and acts on a substrate, which is the specific molecule it catalyzes. Cofactors are non-protein helpers for enzymes, templates guide synthesis (e.g., DNA in replication), and the question only describes the molecule enzymes act on, which is substrate.

Answer:

B. substrate.