Which of the following represents a problem for the hypothesis that amino acids can function as neurotransmitters?
A) Amino acids can be released from nerve terminals.
B) EPSPs and IPSPs are produced by application of amino acids onto neurons.
C) Amino acids are localized within neurons.
D) Amino acids play a role in protein synthesis for all nerve cells.
E) None of the above are correct.
Answer: D
Rationale: The fact that amino acids play a role in protein synthesis for all nerve cells is a problem for the hypothesis that amino acids can function as neurotransmitters.
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