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Standard XII
Biology
Question

Which of the following act as a genetic material for Retrovirus?
  1. Single stranded DNA
  2. RNA
  3. Double stranded duplex DNA
  4. DNA-RNA hybrid

A
Single stranded DNA
B
DNA-RNA hybrid
C
Double stranded duplex DNA
D
RNA
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Solution
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Retrovirus is a virus that is composed not of DNA but of RNA. Retroviruses have an enzyme, called as reverse transcriptase, that gives them the unique property of transcribing their RNA into DNA after entering a cell. The retroviral DNA can then integrate into the chromosomal DNA of the host cell, to be expressed there. HIV is a retrovirus.

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