The enzyme DNA dependent RNA polymerase catalyses the polymerisation reaction in ________ direction .

Options

A. only `5' to 3'`
B. only `3' to 5'`
C. Both (a) and (b)
D. None of these

Answer

A

Explanation

(a) : The two strands have opposite polarity and the DNA-dependent RNA polymerase also catalyse the polymerisation in only one direction, that is , `5' rarr 3'` the strand that has the sequence same as RNA (except thymine at the place of uracil ) is displaced during transcription. This strand (which does not code for anything ) is referred to as coding strand.