| 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] In transcription, the strand with 3' \[\to \] 5' polarity acts as the template strand. |
| Reason [R] The enzyme RNA polymerase catalyses the polymerisation in only one direction, i.e. 3 \[\to \] 3'. |
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. In transcription, the strand with 3' \[\to \]5' polarity acts as the template from which mRNA is transcribed as is called the template strand. This is because the enzyme DNA-dependent RNA polymerase catalyses polymerization in only 5' \[\to \] 3' direction.
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