13. From the descriptions below, select the description that best describes the
Receptor-Site Theory of the mechanism of drug action.
a. A drug (the lock) combines with a receptor-site (the key) to produce a
pharmacological effect.
b. A drug (the key) combines with a receptor-site (the lock) to produce a
pharmacological effect.
c. A drug (the receptor-site) combines with cell components (the lock) to
produce a pharmacological effect.
d. A drug (the lock) combines with a receptor-site in the intestine to produce
an essential effect.
14. Select the statement that best contrasts passive transport with active
transport.
a. Active transport occurs when molecules of the drug move from an area of
high concentration to an area of low concentration, while passive transport occurs when
a "carrier molecule" carries a drug molecule across a cell membrane.
b. Passive transport occurs in comatose patients whose cells are unable to
actively absorb drugs through the normal processes.
c. Passive transport occurs when molecules of a drug move from an area of
high concentration to an area of low concentration, while active transport occurs when a
"carrier molecule" carries a drug molecule across a cell membrane.
d. Passive transport occurs when a "carrier molecule" carries drug
molecules from an area of low concentration to an area of high concentration, while
passive transport involves the movement of blood plasma from a low concentration to a
high concentration.
MD0804
3-25
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