In the 'S' phase of the cell cycle:
1.
amount of DNA doubles in each cell.
2.
amount of DNA remains the same in each cell
3.
chromosome number is increased
4.
amount of DNA is reduced to half in each cell.
Select the option which is not correct with respect to enzyme action:
| 1. | Substrate binds with the enzyme at its active site. |
| 2. | Addition of a lot of succinate does not reverse the inhibition of succinic dehydrogenase by malonate |
| 3. | A non-competitive inhibitor binds the enzyme at a site distinct from that which binds the substrate |
| 4. | Malonate is a competitive inhibitor of succinic dehydrogenase |
Which one of the following is a non-reducing carbohydrate?
1. Maltose
2. Sucrose
3. Lactose
4. Ribose 5-phosphate
The enzyme recombinase is required at which stage of meiosis:
| 1. | Pachytene | 2. | Zygotene |
| 3. | Diplotene | 4. | Diakinesis |
The initial step in the digestion of milk in an infant is carried out by:
| 1. Lipase | 2. Trypsin |
| 3. Rennin | 4. Pepsin |
Fructose is absorbed into the blood through mucosa cells of intestine by the process called:
1. Active transport
2. Facilitated transport
3. Simple diffusion
4. Co-transport mechanism
Approximately seventy percent of carbon dioxide absorbed by the blood will be transported to the lungs:
| 1. | as bicarbonate ions |
| 2. | in the form of dissolved gas molecules |
| 3. | by binding to R.B.C |
| 4. | as carbamino-haemoglobin |
Person with blood group AB is considered as universal recipient because he has:
| 1. | both A and B antigens on RBC but no antibodies in the plasma |
| 2. | both A and B antibodies in the plasma |
| 3. | no antigen on RBC and no antigens in the plasma |
| 4. | both A and B antigens in the plasma but no antibodies |
How do parasympathetic neural signals affect the working of the heart?
| 1. | reduce both heart rate and cardiac output |
| 2. | Heart rate is increased without affecting the cardiac output |
| 3. | Both heart rate and cardiac output increased |
| 4. | Heart rate decreases but cardiac output increases |
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