Which one of the following is most appropriately defined:
| 1. | Amensalism is a relationship in which one species is benefited whereas the other is unaffected |
| 2. | Predator is an organism that catches and kills other organism for food. |
| 3. | Parasite is an organism which always lives inside the body of another organism and may kill it. |
| 4. | Host is an organism which provides food to another organism. |
Jaundice is a disorder of:
1. Skin and eyes
2. Digestive system
3. Circulatory system
4. Excretory system
A person suffering from a disease caused by Plasmodium, experiences recurring chill and fever at the time when:
| 1. | the trophozoites reach maximum growth and give out certain toxins. |
| 2. | the parasite after its rapid multiplication inside RBCs ruptures them, releasing the stage to enter fresh RBCs. |
| 3. | the microgametocytes and megagametocytes are being destroyed by the WBCs. |
| 4. | the sporozoites released from RBCs are being rapidly killed and broken down inside the spleen. |
Which one of the following techniques is safest for the detection of cancers:
1. Radiography (X-ray)
2. Computed tomography (CT)
3. Histopathological studies
4. Magnetic resonance imaging (MRI)
The 3'-5' phosphodiester linkages inside a polynucleotide chain serve to join:
| 1. | One nucleoside with another nucleoside |
| 2. | One nucleotide with another nucleotide |
| 3. | One nitrogenous base with pentose sugar |
| 4. | One DNA strand with the other DNA strand |
In genetic engineering, a DNA segment (gene) of interest is transferred to the host cell through a vector. Consider the following four agents (A-D) in this regard and select the correct option about which one or more of these can be used as a vector/vectors:
| A. | a bacterium | B. | plasmid |
| C. | plasmodium | D. | bacteriophage |
Options:
| 1. | (A) only | 2. | (A) and (C) only |
| 3. | (B) and (D) only | 4. | (A), (B) and (D) only |
The fruit fly Drosophila melanogaster was found to be very suitable for experimental verification of the chromosomal theory of inheritance by Morgan and his colleagues because:
| 1. | a single mating produces two young flies |
| 2. | smaller female is easily recognisable from a large male |
| 3. | it completes its life cycle in about two weeks |
| 4. | it reproduces parthenogenetically |
Signals from fully developed foetus and placenta ultimately lead to parturition which requires the release of:
| 1. | Oxytocin from maternal pituitary |
| 2. | Oxytocin from foetal pituitary |
| 3. | Relaxin from the placenta |
| 4. | Estrogen from placenta |
The Indian Rhinoceros is a natural inhabitant of which one of the Indian states:
| 1. | Uttar Pradesh | 2. | Himachal Pradesh |
| 3. | Assam | 4. | Uttarakhand |
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The haemoglobin content per 100 ml of blood of a normal healthy human adult is:
| 1. | 25-30 g | 2. | 17-20g |
| 3. | 12-16 g | 4. | 5-11 |
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