Which of the following is the simplest amino acid

Genetic codes are

The chromosomes as thread like structures in nucleus was first described by

In $t-RNA$

In lac operon, the lac $mRNA$

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