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Consider the following statements: Which of the statements given above is/are correct?(2021)

Consider the following statements:

1. Adenoviruses have single-stranded DNA genomes whereas retroviruses have double-stranded DNA genomes.

2. Common cold is sometimes caused by an adenovirus whereas AIDS is caused by a retrovirus.

Which of the statements given above is/are correct?(2021)

a) 1 only

b) 2 only

c) Both 1 and 2

d) Neither 1 nor 2

Answer: B

Adenoviruses are medium-sized (90–100 nm), non-enveloped, icosahedral viruses composed of a nucleocapsid and a linear, double-stranded DNA (dsDNA) genome. Viruses of the family Adenoviridae infect vertebrates, including humans.

In a double stranded RNA form, retroviruses infect a host cell with their genome, and then are reverse transcribed into double stranded DNA, with the DNA then integrated into the home cell genome. The virus thereafter replicates as part of the host cell’s DNA

March 2024