| Direction: Each of these questions contains two statements |
| Assertion [A] and Reason [R]. Each of these questions also has four alternative choices, any one of which is the correct answer. You have to select one of the codes [a], [b], [c] and [d] given below. |
| Assertion [A] Viruses having RNA genome and shorter lifespan, mutate and evolve faster. |
| Reason [R] RNA is unstable and thus mutates faster. |
A) Both A and R are true and R is the correct explanation of A
B) Both A and R are true, but R is not the correct explanation of A
C) A is true, but R is false
D) A is false, but R is true
Correct Answer: A
Solution :
[a] Both A and R are true and R is the correct explanation of A. RNA is an unstable catalytic molecule. It mutates at a faster rate than DNA. Thus, viruses having RNA genome and shorter lifespan, mutate and evolve faster due to this unstability.
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