What is the rationale behind having a motorcycle helmet law that applies only to teens? a. teens and children are valued more. b. education should occur at a young age. c. teens have higher risk. d. teens have little political power.

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.