Escherichia coli preferentially utilizes glucose by preventing the uptake of lactose and switching off transcription of the lac operon. This mechanism is known as 

TLS Online TPP Program

#Question id: 2754

#Unit 2. Cellular Organization

The E. coli chromosome is a closed-circular DNA of length 4.6 million base pairs, which resides in a region of the cell called the:

TLS Online TPP Program

#Question id: 18844

#Unit 13. Methods in Biology

In the extraction of DNA from cell with to remove the high protein content from the cell , before phenol treatment which of the following treatment is done 

TLS Online TPP Program

#Question id: 19721

#Unit 3. Fundamental Processes

Three stacked G quartets are the characteristics of 

TLS Online TPP Program

#Question id: 7548

#General Aptitude

 It takes 10 s and 15 s respectively, foe two snakes travelling at different constant speeds to completely pass a small pebble. The length of the first snake is 120 cm and that of the second snake is 150 cm. the magnitude of the difference in the speeds of the two Snakes (in cm/s) is;

TLS Online TPP Program

#Question id: 5617

#Unit 5. Developmental Biology

In sea urchins and mammals, the rise in Ca2+ concentration responsible for the cortical granule reaction is due to