CSIR Life Science Question Paper with Answers June And December 2013.
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CSIR Life Science Question Paper with Answers June And December 2013
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While attempting to create a disease model of poliomyelitis in mice, it was found that mice can not be infected with the said virus. Since human beings are susceptible to this viral infection, which kind of transgenic mice should be generated to have a transgenic mouse model that can be infected with polio virus? Select the right approach from below:
I. A mouse expressing surface protein of polio virus.
2. A mouse expressing human receptor gene which makes cell surface protein for docking and internalization of polio virus.
3. A mouse expressing human MKC class II invariant chain.
4. A mouse expressing human receptor gene which makes cell surface protein for docking and internalization of polio virus along with a gene designed to express surface protein of this virus at puberty.
Which of the following is the most likely explanation for thcse patterns?
l.The finches represent an example of directional trend in beak size from small to big.
2. Beak shapes changed in response to different seed types and these changes were inherited by subsequent generations.
3. The ancestral finch already had all the beak variations and different lineages formed that were specialized to eat different seed types.
4. The finches represent an example of adaptive radiation in which beak variation was generated by mutation followed by selection by different seed types.
Complex eukaryotic cells may have evolved from simpler prokaryotic cells because complexity of organization increases the
I. growth rate.
2. efficiency of energy utilization.
3. tolerance to starvation.
4. ability to attain larger size.
A plant with blue-coloured flowers was observed to attract a large number of pollinators. However, these flowers were not producing any nectar. Which of the following can be a logical explanation to the observation?
I .There could be another species in the vicinity that has blue flowers and is rich in nectar.
2. There is no other species with blue flowers in the vicinity so pollinators are compelled to visit this species.
3. Pollinators may not have blue-colour vision.
4.Pollinators may be able to see only blue
Answer Keys June 2013
CSIR Life Science Question Paper December 2013
Answer Keys December 2013