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Exam Details

LIFE SCIENCE PART B (DECEMBER 2019) 2019

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Questions 50
Duration 180 mins
Package CSIR NET & SET - Previous Year Papers

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Medium 27 54%
Hard 23 46%

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Multiple Choices 50 100%

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1
2019 · Unclassified
LIFE SCIENCE PART B (DECEMBER 2019) 2019
Which one of the following graphs best describes the dependence of free energy change (DG) of ATP hydrolysis on Mg2+ concentration?
A
B
C
D
2
2019 · Unclassified
LIFE SCIENCE PART B (DECEMBER 2019) 2019
Which one of the following statements is true regarding amino acids?
A
Proline has high propensity to form a-helix in globular proteins
B
Both isoleucine and threonine can exist as diastereomers
C
The y dihedral angle of proline is more restricted than the F dihedral angle
D
Side chain pKa of aspartic acid is more than the side chain pKa of glutamic acid
3
2019 · Unclassified
LIFE SCIENCE PART B (DECEMBER 2019) 2019
Match the following vitamins with the corresponding pathological conditions arising from their deficiencies.
A
i – c; ii – a; iii – d; iv – b
B
i – c; ii – a; iii – b; iv – d
C
i – d; ii – a; iii – b; iv – d
D
i – c; ii – b; iii – d; iv – a
4
2019 · Unclassified
LIFE SCIENCE PART B (DECEMBER 2019) 2019
The interaction energy between two opposite charges separated by 3A in vacuum is -500 kJmol-1. The interaction energy between these two charges in water will be closet to
A
- 1500 kJmol-1
B
- 166 kJmol-1
C
- 55 kJmol-1
D
-6 kJmol-1
5
2019 · Unclassified
LIFE SCIENCE PART B (DECEMBER 2019) 2019
For bacterial growth, a single cell elongates in size before it divides into two, in a process called binary fission. During cell growth,
A
new peptidoglycan synthesis is required along with the hydrolysis of bonds linking the old peptidoglycan chains.
B
the old peptidoglycan is completely degraded and replaced with the newly synthesized longer polymer.
C
newly synthesized peptidoglycan is utilized to deposit a new layer of the peptidoglycan in the cell wall.
D
new peptidoglycan synthesis is required but no hydrolysis of the old peptidoglycan occurs.
6
2019 · Unclassified
LIFE SCIENCE PART B (DECEMBER 2019) 2019
Phosphoenol pyruvate: sugar phosphotransferase system (PTS) transports a variety of sugars into bacteria. In E. coli, PTS consists of EI, EII (EIIA, EIIB, and EIIC), and Hpr. During this process the sugar molecule is phosphorylated by direct transfer of phosphate group from:
A
EI – P
B
EIIA – P
C
EIIB – P
D
Hpr – P