Multiple Choice
The diagram shows a cartoon describing the lock and key model of biological interactions.What do A and B represent? 
A) A represents an enzyme and B represents a drug or hormone.
B) A represents a drug or hormone and B represents an enzyme.
C) A represents a drug or hormone and B represents a cell membrane receptor site.
D) A represents a cell membrane receptor site and B represents a drug or hormone.
Correct Answer:
Verified
Correct Answer:
Verified
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