In a biological reaction involving an enzyme, the active site of an enzyme binds

a. the active site of another enzyme.

b. the substrate.

c. the inactive site of another enzyme.

d. the catalyst.

The answer is B, ( The Substrate )!! I had the same question.

answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation:

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.