Molecular Basis...

If 30 percent of an organism’s DNA is thymine, then

In biochemical genetics the term gene is being replaced by

Select the two correct statements out of the four (a–d) given below about lac operon.
(a) Glucose or galactose may bind with the repressor and inactivate it
(b) In the absence of lactose the repressor binds with the operator region
(c) The z-gene codes for permease
(d) This was elucidated by Francois Jacob and Jacque Mono.
The correct statements are

E. coli cells with a mutated z gene of the lac operon cannot grow in medium containing only lactose as the source of energy because

Transcription of DNA into mRNA occurs in the nucleus of the cell but translation occurs in

In lac operon, lactose is the substrate for enzyme beta-galactocidase and its regulates

Lac operon consists of

Assertion: Regulation of lac operon by repressor is referred to as negative regulation.
Reason: Lac operon is under the control of positive regulation as well.

The correct sequence of gene expression is
a. Formation of primary transcript
b. Regulation of splicing
c. Transport of mRNA from nucleus to cytoplasm>
d. Translation