Two sister chromatids are attatched with

Now a days which of the following are known as "magic circles"

Which of the following enzyme can form $RNA$ from $DNA$

Select the two correct statements out of the four $(i -iv)$ statements given below about lac operon.

$(i)$ Glucose or galactose may bind with the repressor and inactivate it.

$(ii)$ In the absence of lactose the repressor binds with the operator region.

$(iii)$ The z­gene codes for permease.

$(iv)$ This was elucidated by Francois Jacob and Jacques Monod.

The correct statements are

A $DNA$ strand is directly involved in the synthesis of following except