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Exam Details

LIFE SCIENCE PART C (DECEMBER 2019) 2019

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Questions 75
Duration 180 mins
Package CSIR NET & SET - Previous Year Papers

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Medium 47 62.7%
Hard 27 36%
Easy 1 1.3%

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Multiple Choices 75 100%

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1
2019 · Unclassified
LIFE SCIENCE PART C (DECEMBER 2019) 2019
A form and Z form of double stranded DNA differ in the handedness of their helices, nucleotide sequences, and configuration of base to sugar. Based on these properties, which one of the following statements defines a correct combination for A and Z forms of DNA?
A
Right handed doubled helix and anti-configuration for the base to sugar arrangement in A DNA; and left handed double helix with alternative sequence of G and C (as a general pattern), and alternating syn- and anti-configurations for the base to sugar arrangement in the Z DNA
B
Left-handed double helix and anti-configuration for base to sugar arrangement in the A form DNA and right-handed double helix and syn- configuration for base to sugar arrangement in the Z form DNA
C
Left-handed double helix and syn-configuration for base to sugar arrangement in the A form DNA and right-handed double helix and anti- configuration for the base to sugar arrangement for the Z form DNA
D
Right handed double helix and syn-configuration for the base to sugar arrangement in A DNA; and left handed double helix with alternating A and G sequence (as a general pattern), and anti-configurations for base to sugar arrangement in the Z DNA
2
2019 · Unclassified
LIFE SCIENCE PART C (DECEMBER 2019) 2019
Given below is the [P] vs time plot of an enzymatic reaction carried out by the enzyme ‘X’Which one of the following statements is the correct interpretation of the data?
A
The Km and Vmax of the enzyme ‘X’ are 15 and 60 units, respectively.
B
The Vmax is 60 but the Km cannot be determined.
C
The Km is 15 but the Vmax cannot be determined
D
Neither the Km nor the Vmax of the enzyme ‘X’ can be determined from these data
3
2019 · Unclassified
LIFE SCIENCE PART C (DECEMBER 2019) 2019
Given below are some physicochemical properties (column X) and their manifestations (column Y).
Which one of the following is the most appropriate match?
A
a = i, b = iv, c – ii, d – iii
B
a = iii, b – ii, c – iv, d – i
C
a = ii, b – iii, c – iv, d – i
D
a = iv, b – ii, c – i, d – iii
4
2019 · Unclassified
LIFE SCIENCE PART C (DECEMBER 2019) 2019
The following observations are made on a 30-residue polypeptide
i. Unordered structure is observed in water, but a helical conformation is observed in a medium of low dielectric constant
ii. The peptide is resistant to degradation by proteases.
iii. Red blood cells are lysed by the peptide.
iv. β-mercaptoethanol has no effect on peptide structure.
Which of the following statements can be correctly attributed to the above observations?
A
The peptide is entirely composed of D-amino acids and is amphipathic.
B
the peptide is rich in disulphide bonds between D-cysteines.
C
The peptide is entirely composed of L-aromatic amino acids.
D
The peptide is entirely composed of L-amino acids and is not amphipathic.
5
2019 · Unclassified
LIFE SCIENCE PART C (DECEMBER 2019) 2019
The following statements are made.i. B form of DNA has ~10 base pairs/turn and A form of DNA has ~2.3 A helix rise per base pairii. Both the A and B form of DNA have wider major groove and narrow minor grooveiii. The crystalline nature of cellulose is brought about by α (1→4) linkage between the glucose subunits.iv. The double bonds in natural lipids are always cis, which provides fluidity to the plasma membrane.Which of the following combinations represent the correct statements?
A
i and iii
B
ii and iii
C
i and iv
D
iii and iv
6
2019 · Unclassified
LIFE SCIENCE PART C (DECEMBER 2019) 2019
Analysis of a homotetrameric protein and a double stranded DNA (that had been incubated in standard buffer) on native gels revealed that they migrated true to their physical states (tetrameric nature of the protein and double stranded nature of the DNA). Following hypotheses were made for the effect of adding high salt to the incubation mix and subsequent analysis on native gels.i. The protein would migrate as a homotetramer and DNA in double stranded form.ii. The protein would migrate as a monomer but DNA in double stranded form.iii. The protein would migrate as a homotetramer but the DNA in single stranded form.iv. The protein would migrate as a monomer and the DNA in single stranded form.Which of the following combination of hypotheses is most likely?
A
i and ii
B
iii and iv
C
i and iv
D
ii and iii