131.

Sponatneity of mutation means

• Mutation in absence of exogenous mutagen     

• Mutation directly proportion to presence of mutagen   

• Mutation at in appropriate time    

• Mutation at in appropriate time

Plasmid copy number achieved by plasmid encoded control elements that regulate the initiation of the replication step. For example in stringent plasmid protein Rep A dimerize and binds to origin of replication and do not allow replication more than once. What mutation may convert this stringent mode of replication in plasmid into relaxed one?

• Over expression in rep A protein     

• Mutation in rep A gene in dimerization domain   

• Mutation in rep A gene in dimerization domain     

• Gain of function in recognition domain of rep A    

Ants and bees social structure include queen, sterile female workers and soldier drones. This is best example of

• Eusociality

• Sub-social      

• Group selection  

• Altruism

Among the following which is insulin dependent glucose transporter?

• GLUT1 

• GLUT2

• GLUT4

• GLUT5

What would be the effect on serum concentration of TSH if a bolus of thyroxine is injected to a person?

• Remain unchanged    

• First increase and then come to normal    

• Initially decrease but after short time will be normal 

• Remain high for prolonged period of time   

Substrate for DNA synthesis is?

• Nucleotide tri phosphate       

• Nucleoside tri phosphate  

• Nucleoside pyrophosphate   

• Ribonucleotide tri phosphate 

Treatment of acetosyringone is given during transfer of transgene using Agrobacterium as vector. The rationale behind this is that acetosyringine

• Helps in anchorage of bacteria to plant cell wall    

• Activates vir operon of bacteria   

• Helps in intergration of T-DNA in plant genome   

• Promotes bacterial growth by activating genes in plant   

Optimum temperature for growth of extreme theromophiles is

• 0°C

• 20°C

• 50°C

• Over 80°C

When a person enters a dark room from bright sunlight he cannot see anything for a few seconds because

• Rhodopsin pigment of rod cells is inactivated in bright light which takes time and is activated in dark and associate with opsin protein.     

• Scotoposin proteins of rods are denatured  

• All Scotoposin are bound with retinal in rod cells   

• All Scotoposin becomes non-functional in bright light     

Largest reservoir of carbon is

• Atmosphere

• Ocean sediments

• Carbonate and silictae rocks

• Inorganic carbon in earth mantle