Harry is going to Mei's house to feed Mei's cat while she is gone. Mei left Harry her key ring, but when Harry reaches the front door, he realizes he doesn't know which key fits the lock. He tries several before finding the right one. If we compare the key and the lock to the behaviour of communicating neurons, we can say that the key is like a __________________ and the lock is like a ________________________.
A)vesicle; synaptic space
B)neurotransmitter; receptor site
C)presynaptic neuron; vesicle
D)neurotransmitter; node of Ranvier
E)receptor site; vesicle

Question

Quizplus · Accepted Answer

The key is analogous to a neurotransmitter because it is the specific element that must fit into the lock to open the door, similar to how a neurotransmitter must bind to a specific receptor site to elicit a response. The lock is analogous to a receptor site because it is the specific structure that the key (or neurotransmitter) must fit into to unlock the door (or initiate a cellular response).

Harry Is Going to Mei's House to Feed Mei's Cat