An athlete is running and suddenly steps on an unexpected rock and rolls her ankle which results in immediate pain. What system does this spredominantly activate? a. sympathetic nervous system
b. central nervous system
c. parasympathetic nervous system
d. enteric nervous system

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.