Consider the following statements :

1. Some mushrooms have medicinal properties.

2. Some mushrooms have psycho-active properties.

3. Some mushrooms have insecticidal properties.

4. Some mushrooms have bioluminescent properties.

How many of the above statements are correct? 

Consider the following statements :

1. Some microorganisms can grow in environments with temperature above the boiling point of water.

2. Some microorganisms can grow in environments with temperature below the freezing point of water.

3. Some microorganisms can grow in highly acidic environment with a pH below 3.

How many of the above statements are correct?

'Microsatellite DNA' is used in the case of which one of the following?

Which one of the following statements best describes the role of B cells and T cells in the human body?