CSIR NET Life Sciences MCQs Part 1

CSIR NET Life Sciences MCQs

1. Of the following, which is the odd one out?

• Cone
• Torus
• Sphere
• Ellipsoid

2. “My friend Raju has more than 1000 books”, said Ram. “Oh no, he has less than 1000 books”, said Shyam. “Well, Raju certainly has at least one book”, said Geeta. If only one of these statements is true, how many books does Raju have?

• 1
• 1000
• 999
• 1001

3. Predominant interactions between phospholipids that stabilize a biological membrane include

• hydrogen bonds and covalent interactions
• van der Waal and ionic interactions
• hydrophobic interactions and hydrogen bonding
• covalent and hydrophobic interactions

4. Entry of enveloped viruses into its host cells is mediated by:

• Only endocytosis
• Both endocytosis and phagocytosis
• Both endocytosis and membrane fusion
• Only pinocytosis

5. Lateral diffusion of proteins in membrane can be followed and diffusion rate calculated by

• Atomic force microscopy
• Scanning electron microscopy
• Transmission electron microscopy
• FRAP

6. Histone deacytalase (HDAC) catalyses the removal of acetyl group from N-terminal of histones. Which amino acid of histone is involved in this process?

• Lysine
• Arginine
• Asparagine
• Histidine

7. Two interacting genes (independently assorting) were involved in the same pathway. Absence of either genes function leads to absence of the end product of the pathway. A dihybrid cross involving the two genes is carried out. What fraction of the F2 progeny will show the presence of the end product?

• 1/4
• 3/4
• 9/16
• 15/16

8. For two species A and B in competition, the carrying capacities and competition coefficients are K_A = 150 K_B = 200, Alpha = 1.0 Beta = 1.3 According to the Lotka-Volterra model of interspecific competition, the outcome of competition will be

• Species A wins
• Species B wins
• Both species reach a stable equilibrium
• Both species reach an unstable equilibrium

9. One hundred independent populations of Drosophila are established with 10 individuals in each population, of which, one individual is of Aa genotype and the other nine are of AA genotype. If random genetic drift is the only mechanism acting on these populations, then, after a large number of generations, the expected number of populations fixed for the "a" allele is

• 75
• 50
• 25
• 5

10. In a typical gene cloning experiment, by mistake a researcher introduced the DNA of interest within ampicilin resistant gene instead of lac z gene. The competent cells were allowed to take up the plasmid and then plated in the media containing ampicilin, X-gal and IPTG and subjected to blue-white screening. Considering all plasmids were recombinant which one of the following statements correctly describes the outcome of the experiment?

• The bacteria which took up the plasmids would grow and give blue colonies
• The bacteria which took up the plasmids would not grow
• The bacteria which took up the plasmids would form white colonies
• All of the bacteria would grow and give white colonies

Score =

Correct answers:

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

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