Glucose molecules diffuse across a cell of diameter d in time τ. If the cell diameter I tripled, the diffusion time would

• Increase to 9 τ

• Decrease to τ/3

• Increase to 3 τ

• Decrease to τ/9

In all four gametes AB, aB, Ab and ab are formed in equal probability. Then arrangement of chromosomes at metaphase - I of meiosis will be :-

Which cycle has been used in hetero lactic fermentation?

• Entner-Doudoroff pathway

• Phosphoketolase pathway

• Pentose Phosphate pathway

• Glycolate pathway

The characteristic of mitochondrial genome is?

• Intron free DNA

• Repetitive DNA

• Polycistronic RNA

• Satellite DNA

Among the following which cell can divide by binary fission.

• Muscle cell  

• Nerve cell    

• RBC

• Bone marrow cell

Cell with large round size has more chance to survive as compare to thin cell under desiccation because of

• Low surface to volume ratio    

• High surface to volume ratio  

• Thin membrane     

• Thick membrane  

Na⁺-K⁺ pump operates under intracellular concentration of

• High Na and low K   

• High Na and High K

• Low Na and low K 

• Low Na and high K  

8.

In an organism if number of linkage group is 12 then, number of haploid set of chromosome is

• 12

• 6

• 24

• 4

Th2 response is generated and maintained mainly by which of the following cytokines?

• IL-4 and IL-10

• IL-12 and INF-γ

• INF-γ and TNR-α

• IL-2 and IL-12

Using molecular clock, it was estimated that two species A and B must have diverged from their common ancestor about 9 X 10⁶ years ago. If the rate of divergence per base pair is estimated to be 0.0015 per million years, what is the proportion of base pairs that differ between the two species now?

• 0,0270

• 0.0135

• 0.00017

• 0.0035