Kin Cheng is covered by Golden Sun PPO and has a copay of $15. Golden Sun PPO pays a discounted fee-for-service of 80 percent of the provider's usual charge. For his last office visit , the charges totaled $143.50. What amount is paid to the provider ? By whom?

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.