NEET BIOLOGY

BIOLOGICAL CLASSIFICATION

KINGDOM MONERA

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
which of the following statements is not true for retroviruses?
A
DNA is not present at any stage in the life cycle of retroviruses
B
Retroviruses carry gene for RNA dependent DNA polymerase
C
The genetic material in mature retroviruses is RNA
D
Retroviruses are causative agents for certain kinds of cancer in man
Explanation: 

Detailed explanation-1: -So, the correct answer is option (D), DNA is not present at any stage in the life cycle of retroviruses.

Detailed explanation-2: -So, the correct answer is ‘An RNA virus that can synthesise DNA during infection. ‘

Detailed explanation-3: -Retroviruses carry their genome as RNA, and because they replicate via a DNA intermediate, they must also carry the sequence for the promoter that will drive the expression of the genomic RNA.

Detailed explanation-4: -All retroviruses are protein-enveloped, positive-stranded RNA viruses that encode a unique enzyme, RT, capable of catalyzing the flow of genetic information from RNA to DNA, counter to that of most biologic systems.

Detailed explanation-5: -What molecule would you not expect to find in a retrovirus? Explanation: Retroviruses carry RNA and when they infect a host cell, they use their own reverse transciptase to made DNA from that RNA; therefore, within the virus, there are only the molecules that make up RNA.

There is 1 question to complete.