Quiz 20-January-2024

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Labmonk quiz, NET Life Science,

#1. In one study, a group of 5-day rat pups were fed for 3 weeks a diet A and the pups gained weight by 300%. In a second study, when the same diet fed for 3 weeks to rats of 350 gms, they did not gain weight significantly. In a third study, a diet B was fed to 250-350 gms rats and it was observed that they delivered normal pups after five weeks. Based on these observations which of the following statements is correct?

Diet A is more energy containing than diet ‘B’. Hence, its quantity should be reduced.

Diet A facilitates weight gain than diet B.

More control experiments are to be conducted for definitive conclusion.

Diet B facilitates pregnancy and childbearing.

#2. Living beings get energy from food through the process of aerobic respiration. One of the reactants is

oxygen

carbon dioxide

water vapour

phosphorus

#3. Proteins in cells can be visualized by the following methods: P. Express the gene (coding for the said protein) as a fusion with the green fluorescence protein (GFP) and directly visualize under a fluorescence microscope. Q. Express the gene (coding for the said protein) as a fusion with the β-galactosidase gene (lac Z) and directly visualize under a phase contrast bright field microscope. R. A fluorescence tagged antibody raised against the said protein could be used for visualization in a fluorescence microscope. S. Overexpress the protein and directly visualize it under a scanning electron microscope. Which of the following methods you would choose to visualize a protein in a living cell?

P and R only

P only

P and Q only

S only

#4. In ΔABC, angle A is larger than angle C and smaller than angle B by the same amount. If angle B is 67°, angle C is

57°

67°

60°

53°

#5. The number of craters observed due to meteoritic impacts during the early stages of formation, is less on the Earth than that on the Moon because,

impacting bodies on the Earth were smaller in size.

craters on the earth are now covered by ocean water.

earlier craters are not preserved due to continuous modification of Earth’s surface by geological processes.

formation of craters on the Earth was difficult due to the presence of hard rocks.

#6. The MALDI spectrum of a peptide shows a peak at m/z corresponding to 3600. When the ESI spectrum is recorded, peaks at m/z corresponding to 721,904 and 1801 were obtained. When the MALDI MS/MS spectrum was recorded, large number of peaks with m/z less than 3600 were observed. The spectral data indicate that the peptide is

degraded under condition employed for recording ESI spectrum.

highly unstable and degrades rapidly.

highly impure.

pure with molecular mass of 3600 and partial sequence of the peptide can be determined.

#7. Insertion lambda vectors are used to create cDNA libraries. In some insertion vectors, the site of insertion is within the cI gene. The recombinants which are cI can then be screened by plating on E. coli hfl. The gene hfl encodes a protease that controls lytic-lysogeny decision through which mechanism?

Hfl protease degrades cII, and therefore cI synthesis cannot be established, thus lytic pathway is preferred.

Hfl protease degrades cI, thereby promoting lytic pathway.

Hfl protease degrades cIII and so cIII cannot interact, with cII. The lysogenic pathway is thus preferred.

Hfl protease degrades INT, the protein involved in phage integration and the lytic pathway is initiated.

#8. Which of the following statements about the concentration of CO2 in the Earth’s atmosphere is true?

Its levels today are the highest in the Earth’s history.

It has steadily increased since the formation of the Earth’s atmosphere.

It has steadily decreased since the formation of the Earth’s atmosphere.

It was the highest in the very early atmosphere of the Earth.

#9. Magnesium powder, placed in an air-tight glass container at 1.0 bar, is burnt by focusing sunlight. Part of the magnesium burns off, and some is left behind. The pressure of the air in the container after it has returned to room temperature is approximately

0.8 bar

1.2 bar

1.0 bar

0.2 bar

#10. See the following mathematical manipulations. 1. Let x = 5 2. then x2 – 25 = x – 5 3. (x – 5) (x + 5) = x – 5 4. x + 5 = 1 [cancelling (x – 5) from both sides] 5. 10 = 1 [Putting x = 5] Which of the above is the wrong step?

3 to 4

1 to 2

4 to 5

2 to 3

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Quiz 20-January-2024

#2. Living beings get energy from food through the process of aerobic respiration. One of the reactants is

#4. In ΔABC, angle A is larger than angle C and smaller than angle B by the same amount. If angle B is 67°, angle C is

#5. The number of craters observed due to meteoritic impacts during the early stages of formation, is less on the Earth than that on the Moon because,

#8. Which of the following statements about the concentration of CO2 in the Earth’s atmosphere is true?

#9. Magnesium powder, placed in an air-tight glass container at 1.0 bar, is burnt by focusing sunlight. Part of the magnesium burns off, and some is left behind. The pressure of the air in the container after it has returned to room temperature is approximately

#10. See the following mathematical manipulations. 1. Let x = 5 2. then x2 – 25 = x – 5 3. (x – 5) (x + 5) = x – 5 4. x + 5 = 1 [cancelling (x – 5) from both sides] 5. 10 = 1 [Putting x = 5] Which of the above is the wrong step?

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