Which of the following statements about DNA viruses are true?

Select all that apply.

A. DNA viruses are considered living, unlike RNA viruses.

B. Types I and II of the Baltimore system are used for classifying DNA viruses only.

C. DNA viruses have a very high mutation rate.

D. Double-stranded DNA viruses are more common than single-stranded DNA viruses

Answer;

B. Types I and II of the Baltimore system are used for classifying DNA viruses only.

D. Double-stranded DNA viruses are more common than single-stranded DNA viruses

Explanation; The Baltimore classification is a virus classification system that groups viruses into families, depending on their type of genome, that is DNA, RNA, single-stranded (ss), double-stranded (ds), etc ...) and their method of replication. Type I is composed of double-stranded DNA viruses and Type II has single-stranded DNA viruses. RNA viruses have much higher mutation rates compared to the DNA viruses, they have approximately one mutation per virus genome copy.