Question

question 17 of 22
what is the structure labeled a?
a. an enzyme
b. a product
c. a protein
d. a substrate

Explanation:

Enzymes are biological catalysts that bind to substrates. In the lock - and - key model (illustrated here), the structure labeled A (which has a specific shape that fits with other molecules) is an enzyme. Proteins is a more general term (enzymes are proteins, but the question is about the specific role in the reaction depicted). Products are the end - result of the reaction (formed after the enzyme - substrate interaction). Substrates are the molecules that bind to the enzyme (the ones that would fit into the enzyme's active site, not the enzyme itself).

Answer:

A. An enzyme