Q. 21. In some viruses, DNA is synthesized by using RNA as a template. Such a DNA is called
(a) A-DNA
(b) B-DNA
(c) cDNA
(d) rDNA
(c) In some viruses, like retroviruses (e.g., HIV), an enzyme called reverse transcriptase is used to generate complementary DNA (cDNA) from an RNA template. This process is termed reverse transcription.
