ATPase enzyme needed for muscle contraction is located in:

1. Troponin

2. Myosin

3. Actin

4. Actinin 

Certain characteristic demographic features of developing countries are: 

Duodenum has characteristic Brunner's glands which secrete two hormones called:
1. Secretin, Cholecystokinin
2. Prolactin, parathormone
3. Extradiol, progesterone
4. Kinase, estrogen 

Cancer cells are more easily damaged by radiation than normal cells because they are:

Which one of the following is not correctly matched:

1. Culex pipiens – Filariasis

2. Aedes aegypti – Yellow fever

3. Anopheles culifaciens – Leishmaniasis

4. Glossina palpalis – Sleeping sickness

Which one of the following pairs is not correctly matched:

1. Serratia – Drug addiction

2. Spirulina – Single-cell protein

3. Rhizobium – Biofertilizer

4. Streptomyces – Antibiotic 

Which one of the following pair correctly matches a hormone with a disease resulting from its deficiency:

1. Insulin – Diabetes insipidus

2. Thyroxine – Tetany

3. Parathyroid hormone – Diabetes mellitus

4. Luteinizing hormone – Failure of ovulation 

A major component of gobar gas is:

A free-living nitrogen-fixing cyanobacterium that can also form a symbiotic association with the water fern Azolla is:

1. Chlorella

2. Nostoc

3. Anabaena

4. Tolypothrix

In the ABO system of blood groups, if both antigens are present but no antibody, the blood group of the individual would be: