A woman with cardiac disease has come to the office for prenatal counseling. According to the functional classification system developed by the Criteria Committee of the New York Heart Association, the woman would be cautioned against pregnancy based on which category?

A) class IV
B) class III
C) class I
D) class II

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.