(Model Paper) CSIR-UGC NET Exam "Life Sciences"

CSIR-UGC NET Exam Model Paper

Subject: Life Sciences

21. Which of the following bonds will be most difficult to break?

1. C–O
2. C–C
3. C–N
4. C–S

22. A solution of 1% (w/v) starch at pH 6.7 is digested by 15 µg of -amylase (mol wt 152,000). The rate of maltose (mol wt = 342) had a maximal initial velocity of 8.5 mg formed per min. The turnover number is

23. The conformation of a nucleotide in DNA is affected by rotation about how many bonds?

1. 4
2. 6
3. 7
4. 3

24. Which of the following proteins acts as an energy transducer?

1. G-protein.
2. Bacteriorhodopsin.
3. Hemoglobin.
4. Heat shock protein.

25. Which of the following predicted property of lipid bilayers would result if the phospholipids had only one hydrocarbon chain instead of two?

1. The bilayers formed would be much less fluid.
2. The diameter of the head group would be much larger than the acyl chain and would tend to form micelles rather than bilayers.
3. the bilayers formed would be much more fluid.
4. the bilayers would be more permeable to small water-soluble molecules.

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