15. From a group below, select the description that best describes the importance
of structure activity relationships.
Drugs that are not similar are ineffective.
Drugs that are active generally have similar structures.
Drugs that are similar in effect generally have the same trade name.
16. Select the statement that best contrasts competitive antagonist with
a. Competitive antagonists combine with the receptor-site and prevent
another drug from combining with the receptor-site, while physiological antagonists
reverse the action of a drug by acting on a different receptor-site to cause different
b. Competitive antagonists produce pharmacological effects by producing a
physiological effect different from the drug, while physiological antagonists
physiologically compete for a spot on the receptor-site.
c. Competitive antagonists combine with the receptor-site and remove the
drug from the site, while physiological antagonists physically compete for the receptor-
d. Physiological antagonists physically remove drug molecules from the
receptor-site, while competitive antagonists compete for the receptor-site.
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