Which of the following is not a mechanism for turning off a neurotransmitter? a) using the neurotransmitter to clog the postsynaptic channels                       b) uptake of the neurotransmitter into the presynaptic cell   c) movement of the neurotransmitter out of the synaptic cleft         d) use of enzymes to alter the neurotransmitter

Which of the following processes within viral replication is the greatest source of genetic variation in rna virus populations? a) high mutation rate due to lack of proofreading of rna genome replication errors.b) transcription from the host cell rna polymerase introduces numerous mutations.c) capsid proteins from the host cell can replace the viral capsid.d) viral rna is translated by host cell ribosomes.