To bind correctly with the __________, drugs must have a similar or complementary chemical structure to that of the receptor.
A) cell receptor.
B) antibody.
C) antigen.
D) All of the above
Question 2
A medicine used for prophylactic purposes is one that:
A) treats a specific condition.
B) replaces deficient substances.
C) removes a substance that causes disease.
D) prevents or lessens the severity of a disease.