Number of $(approximately)$ genes in E. coli are

Which one of the following pairs is correctly matched

The most abundant type of $RNA$ in the cell is

An inactive repressor produced by regulator gene that does not block the operator site in the tryptophan Operon is called

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