If the distance between two consecutive base pairs is 0.34 nm and the total number of base pairs of a DNA double helix in a typical mammalian cell is $6.6\times {10}^9$ bp, then the length of the DNA is approximately:

1.	2.5 meters	2.	2.2 meters
3.	2.7 meters	4.	2.0 meters

Which of the following regions of the globe exhibits the highest species diversity?

Which of the following is put into Anaerobic sludge digester for further sewage treatment?

1. Floating debris 

2. Effluents of primary treatment

3. Activated sludge 

4. Primary sludge 

Dissolution of the synaptonemal complex occurs during : 

Select the option including all sexually transmitted diseases:
1. Gonorrhoea, Malaria, Genital herpes
2. AIDS, Malaria, Filaria
3. Cancer, AIDS, Syphilis
4. Gonorrhoea, Syphilis, Genital herpes

Select the correct statement.

1. Glucagon is associated with hypoglycemia.

2. Insulin acts on pancreatic cells and adipocytes.

3. Insulin is associated with hyperglycemia.

4. Glucocorticoids stimulate gluconeogenesis.

The product(s) of the reaction catalyzed by nitrogenase in root nodules of leguminous plants is/are.

1. Nitrate alone

2. Ammonia and oxygen

3. Ammonia and hydrogen

4. Ammonia alone

In-gel electrophoresis, separated DNA fragments can be visualized with the help of:

1. Ethidium bromide in UV radiation

2. Acetocarmine in UV radiation

3. Ethidium bromide in infrared radiation

4. Acetocarmine in bright blue light

In Which of the following techniques, the embryos are transferred to assist those females who cannot conceive?

Select the correct match: