Question

agonist dose-response curve
% molecular response
concentration of agonist
a competitive antagonist reduces the ____ of an agonist, meaning that the dose - response curve for the agonist will be shifted to the ____
efficacy, right
potency, right
efficacy, left
potency, left

Explanation:

To solve this, we recall concepts in pharmacology (under Medicine and Health, a subfield of Natural Science). A competitive antagonist competes with the agonist for the same receptor. It affects the agonist's potency (the concentration needed to achieve a response), not efficacy (maximum response). A rightward shift of the dose - response curve means higher agonist concentration is needed (reduced potency), while a leftward shift would mean lower concentration (increased potency). Since a competitive antagonist makes the agonist less potent, it shifts the curve to the right. So the correct option is "potency; right".

Answer:

B. potency; right (assuming the option with "potency, right" is labeled as B, adjust the label as per the actual question's option numbering. If the options are as given in the text with the second option being "potency, right", then the answer is the option with "potency, right" e.g., if the options are:
A. efficacy, right
B. potency, right
C. efficacy, left
D. potency, left
Then the answer is B. potency, right)