The two antibiotic resistance genes on vector pBR 322 are for:
1. Ampicillin and Tetracycline
2. Ampicillin and Chloramphenicol
3. Chloramphenicol and Tetracycline
4. Tetracycline and Kanamycin
The exploitation of bioresources of a nation by multinational companies without authorization from the concerned country is referred to as:
| 1. | Bioweapon | 2. | Biopiracy |
| 3. | Bioethics | 4. | Biowar |
Carnivorous animals - lions and leopards, occupy the same niche but lions predate mostly larger animals and leopards take smaller ones. This mechanism of competition is referred to as:
1. Character displacement
2. Altruism
3. Resource partitioning
4. Competitive exclusion
The decline in the population of Indian native fishes due to the introduction of Clarias gariepinus in river Yamuna can be categorised as:
1. Co-extinction
2. Habitat fragmentation
3. Over exploitation
4. Alien species invasion
Match the following RNA polymerases with their transcribed products:
|
Column-I |
Column-II |
||
|
(a) |
RNA polymerase I |
(i) |
tRNA |
|
(b) |
RNA polymerase II |
(ii) |
rRNA |
|
(c) |
RNA polymerase III |
(iii) |
hnRNA |
Select the correct option from the following:
| Options: | (a) | (b) | (c) |
| 1. | i | iii | ii |
| 2. | i | ii | iii |
| 3. | ii | iii | i |
| 4. | iii | ii | i |
In a marriage between a male with blood group A and a female with blood group B, the progeny had either blood group AB or B. What could be the possible genotype of the parents?
1. IA i (Male) ; IB IB (Female)
2. IA IA (Male) ; IB IB (Female)
3. IA IA (Male) ; IB i (Female)
4. IA i (Male) ; IB i(Female)
A population of a species invades a new area. Which of the following condition will lead to Adaptive Radiation?
| 1. | Area with a large number of habitats having very low food supply |
| 2. | Area with a single type of vacant habitat |
| 3. | Area with many types of vacant habitats |
| 4. | Area with many habitats occupied by a large number of species |
Identify A, B and C in the diagrammatic representation of the mechanism of hormone action.
Select the correct option from the following:
| 1. | A = Steroid Hormone; B = Hormone receptor Complex; C = Protein |
| 2. | A = Protein Hormone; B = Receptor; C = Cyclic AMP |
| 3. | A = Steroid Hormone; B = Receptor; C = Second Messenger |
| 4. | A = Protein Hormone; B = Cyclic AMP; C = Hormone-receptor Complex |
Humans have acquired an immune system that produces antibodies to neutralize pathogens. Still innate immune system is present at the time of birth because it:
| 1. | is very specific and uses different macrophages |
| 2. | produces memory cells for mounting a fast secondary response |
| 3. | has natural killer cells that can phagocytose and destroy microbes |
| 4. | provides passive immunity |
Which of the following statements is not correct?
| 1. | An action potential in an axon does not move backward because the segment behind is in a refractory phase. |
| 2. | Depolarization of hair cells of cochlea results in the opening of the mechanically gated Potassium- ion channels. |
| 3. | Rods are very sensitive and contribute to daylight vision. |
| 4. | In the knee-jerk reflex, stimulus is the stretching of muscle and response is its contraction. |
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