question_answer

Select the correct option. [AIPMT 2014]

A)  Direction of RNA synthesis- 5'-3', Direction of reading of the template DNA strand- 3'-5'

B)  Direction of RNA synthesis- 3'-5', Direction of reading of the template DNA strand- 5'-3'

C)  Direction of RNA synthesis- 5'-3', Direction of reading of the template DNA strand- 5?-3?

D)  Direction of RNA synthesis- 3'-5', Direction of reading of the template DNA strand- 3'-5'

Correct Answer: A

Solution :

RNA polymers catalyse polymerisation only in one direction, that 5' ® 3' and the strand that has the polarity 3?® 5' act as a template.