Direct agonist is to direct antagonist as A) glycine is to ...

[EY67]

Direct agonist is to direct antagonist as
 
  A) glycine is to rimonabant.
  B) morphine is to heroin.
  C) reserpine is to amphetamine.
  D) MAO is to dopamine.
  E) endogenous opioid is to naloxone.

Question 2

Stimulation of a presynaptic autoreceptor
 
  A) reduces the release of the neurotransmitter from the axon terminal.
  B) alters the uptake of the neurotransmitter into the axon terminal.
  C) blocks the opening of ion channels in the postsynaptic membrane.
  D) increases the release of the neurotransmitter from the axon terminal.
  E) would be expected to act as an agonist for this synapse.

[tranoy]

Answer to Question 1

Answer: E
Rationale: Direct agonist is to direct antagonist as endogenous opioid is to naloxone.

Answer to Question 2

Answer: A

[EY67]

Thanks for the timely response, appreciate it

[miss.ashley]

Gracias!