Question

Assertion (A) In transcription, the strand with $3' \rightarrow 5'$ polarity acts as the template strand.
Reason (R) The enzyme RNA polymerase catalyses the polymerisation in only one direction, i.e. $5' \rightarrow 3'$.

• A. If both A and R are true and R is the correct explanation of A
• B. If both A and R are true, but R is not the correct explanation of A
• C. If A is true, but R is false
• D. If A is false, but R is true

Answer 1

Answer: (A)

Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
In transcription, the strand with $3' \rightarrow 5'$ polarity acts as the template from which $m RNA$ is transcribed as is called the template strand.
This is because the enzyme DNA-dependent RNA polymerase catalyses polymerisation in only $5' \rightarrow 3'$ direction.