Scientists Are Attempting to Characterize a Novel Neurotransmitter, Neurotran-Y (NTY)

Multiple Choice

Scientists are attempting to characterize a novel neurotransmitter, neurotran-Y (NTY) , which is synthesized by the enzyme neuro-y-oxidase (NYO) from a precursor, neuro-A. In an experiment they inject artificially high levels of NTY into the pre-synaptic terminal of a cell that releases NTY. Shortly thereafter, they measure the activity of NYO and observe that its activity has been suppressed. The scientists have found evidence for

A) reuptake.
B) hydrolyzation.
C) co-transmission.
D) feedback inhibition.
E) fast axonal transport.