Which of the following statement is not true for retroviruses?
DNA is not present at any stage in the life cycle of retroviruses.
Retroviruses carry gene for RNA-dependent DNA polymerase.
The genetic material in mature retroviruses is RNA.
Retroviruses are causative agents for certain kinds of cancer in man.
A
Retroviruses carry gene for RNA-dependent DNA polymerase.
B
Retroviruses are causative agents for certain kinds of cancer in man.
C
DNA is not present at any stage in the life cycle of retroviruses.
D
The genetic material in mature retroviruses is RNA.
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Solution
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A retrovirus contains single-stranded RNA as the genetic material. It contains reverse transcriptase enzyme. It carries gene for RNA-dependent DNA polymerase. RNA is transcribed into DNA after entering a cell. This retroviral DNA integrates into the chromosomal DNA and replicates. This virus is a causative agent for certain kind of cancer in man.
Thus, the correct answer is option A.
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