The activity of acetylcholine in a synapse is terminated by A) ...

[geoffrey]

The activity of acetylcholine in a synapse is terminated by
A) its active transport across the presynaptic membrane.
B) its diffusion across the presynaptic membrane.
C) its active transport across the postsynaptic membrane.
D) its diffusion across the postsynaptic membrane.
E) its degradation by a hydrolytic enzyme on the postsynaptic membrane.

[j_sun]

I recall doing this last year, it's E, bye bye!