Upon Release into the Synapse, Neuropeptides Differ from Small-Molecule Transmitters

Multiple Choice

 Upon release into the synapse, neuropeptides differ from small-molecule transmitters as they

A) cannot be deactivated by enzymes, whereas small-molecule transmitters diffuse away or are deactivated by reuptake.
B) are deactivated by reuptake, whereas small-molecule transmitters diffuse away or are deactivated by enzymes.
C) can diffuse away from synapses, whereas small-molecule transmitters are deactivated by reuptake.
D) and small-molecule transmitters can be deactivated by diffusion, enzymes, or reuptake.