question: Q:A chemical agent is found to denature all enzymes in the synaptic cleft. What effect will this agent have on acetylcholine?? 
  A:Acetylcholine will not be released from the presynaptic membrane.;B:Acetylcholine will not bind to receptor proteins on the postsynaptic membrane.;C:Acetylcholine will not diffuse across the cleft to the postsynaptic membrane.;D:Acetylcholine will not be degraded in the synaptic cleft.