CSIR NET Life Sciences MCQs Part 2

CSIR NET Life Sciences MCQs

1. In each of the following groups of words is a hidden number, based on which you should arrange them in descending order. Pick the correct answer:
E. Papers I Xeroxed
F. Wi-Fi veteran
G. Yourself ourselves
H. Breaks even

• H, F, G, H
• E, G, F, H
• H, F, G, E
• H, E, F, G

2. A person walks downhill at 10 km/h, uphill at 6 km/h and on the plane at 7.5 km/h. If the person takes 3 hours to go from a place A to another place B, and 1 hour on the way back, the distance between A and B is

• 15 km
• 23.5 km
• 16 km
• Given data is insufficient to calculate the distance.

3. Enzymes accelerate a reaction by which one of the following strategies?

• Decreasing energy required to form the transition state
• Increasing kinetic energy of the substrate
• Increasing the free energy difference between substrate and the product
• Increasing the turn over number of enzymes

4. Which one of the following chemicals is a DNA intercalator?

• 5-Bromouracil
• Ethyl methane sulfonate
• Acridine orange
• UV

5. An antibiotic that resembles the 3’end of a charged tRNA molecule is:

• Streptomycin
• Sparsomycin
• Puromycin
• Tetracycline

6. Phenylalanine, a precursor of most of the phenolics in higher plants is a product of which one of the following pathways?

• Shikimic acid pathway
• Malonic acid pathway
• Mevalonic acid pathway
• Methylerythritol pathway

7. Instructive and permissive interactions are two major modes of inductive interaction during development. The following compares some properties of cell lines and cord blood stem cells. Cell lines, which are stored in liquid nitrogen, can be retrieved for experiments, where they behave as per their original self. Cord blood can also be retrieved from liquid nitrogen for procuring stem cells. Unlike cell lines, the stem cells can be additionally induced to undergo differentiation into desired lineages, which are very different from their original self. The behaviour of cell lines and stem cells is analogous to which of the interactions?

• Both cell lines and stem cells show instructive interaction
• Cell lines show instructive interaction whereas stem cells show permissive interaction
• Cell lines show permissive interaction whereas stem cells show instructive interaction
• Both types of cells show permissive instruction

8. When rods of retina kept in dark, were exposed to light, phototransduction occurred. Following are some explanations given by a researcher regarding phototransduction:
A. Activation of transducin
B. Inhibition of cGMP phosphodiesterase
C. Closure of Na+ channels
D. Hyperpolarization of rods
Which one did NOT occur in phototransduction

• only A
• only B
• A and C
• C and D

9. Two siblings who inherit 50% of the genome from the mother and 50% from the father show lot of phenotypic differences. Which one of the following events during gametogenesis of the parents will maximally contribute to this difference?

• Mutation
• Recombination
• Independent assortment
• Environment

10. The following are some important features which are commonly associated with animal development:
A. Position of anus development with respect to blastopore
B. Method of cell division
C. Mechanism of coelom formation
D. Cleavage pattern during egg development
Based on the above, which one of the following combinations differentiate the development of deuterostomes from that of protostomes?

• A, B and C
• B, C and D
• A, C and D
• A and B

Score =

Correct answers:

CSIR NET Life Sciences MCQs Parts => 1.. 2..

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