GATE BT topic:life-sciences PYQs & Answers — Page 57

Questions 561–570 of 650. Imported answers require independent review unless marked reviewed.

Determine the correctness or otherwise of the following Assertion [a] and the Reason [r]

Assertion: The association constant in water for the G-C base pair is three times lower than that for the A-T base pair.

Reason: There are three hydrogen bonds in the G-C base pair and two in the A-T base pair.

Your answerChoose one option.

Both [a] and [r] are true and [r] is the correct reason for [a]

[a] is false but [r] is true

Both [a] and [r] are false

Both [a] and [r] are true and [r] is not the correct reason for [a]

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Which one of the combinations of the following statements is true about antibody structure?

P. Limited proteolysis of rabbit IgG with the enzyme pepsin generates two antigen-binding regions (Fab) and an Fc fragment Q. Limited proteolysis of rabbit IgG with the enzyme papain generates a single bivalent antigen-binding region F(ab′)₂ and peptide fragments R. The Fc fragment of IgG can self-associate and crystallize into a lattice S. The F(ab′)₂ fragment of IgG is composed of both light and heavy chains

Your answerChoose one option.

P and Q only

P and R only

R and S only

Q and S only

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Which one of the following statements is true with regard to processing and presentation of protein antigens?

Your answerChoose one option.

In the class II MHC pathway, protein antigens in the cytosol are processed by proteases

In the class I MHC pathway, extracellular protein antigens are endocytosed into vesicles and processed

In the class I MHC pathway, transporter associated antigen processing (TAP) protein is required for translocating processed peptides generated in the cytosol

Invariant chain in endoplasmic reticulum is involved in transport of peptides and loading of class I MHC

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Which of the following are true about bacterial superoxide dismutase?

P. Present in obligate aerobes Q. Present in facultative anaerobes R. Present in aerotolerant anaerobes S. Absent in obligate aerobes

Your answerChoose one option.

P and Q only

P, Q and R only

P and R only

Q and S only

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Which of the following are true with regard to anaerobic respiration in bacteria?

P. The final electron acceptor is an inorganic substance other than molecular oxygen Q. The number of ATP molecules produced per glucose molecule is more than that produced in aerobic respiration R. The number of ATP molecules produced per glucose molecule is less than that produced in aerobic respiration S. Only substrate level phosphorylation is used to generate ATP

Your answerChoose one option.

P and S only

Q and S only

P and R only

P, Q and S only

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Shear stress versus shear rate behavior of four different types of fluids (I, II, III and IV) are shown in the figure below.

Which one of the following options is correct?

Your answerChoose one option.

I-Newtonian, II-Bingham plastic, III-Dilant, IV-Pseudoplastic

I-Pseudoplastic, II-Dilant, III-Newtonian, IV-Bingham plastic

I-Newtonian, II-Pseudoplastic, III-Bingham plastic, IV-Dilant

I-Newtonian, II-Bingham plastic, III-Pseudoplastic, IV-Dilant

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An analysis of DNA-protein interactions was carried out using all DNA-protein complexes in the protein data bank (PDB). The frequency distribution of four amino acid residues, represented as P, Q, R and S, occurring in non-covalent interactions between the protein and DNA backbone is shown below.

Which one of the following is correct?

Your answerChoose one option.

P-Lys, Q-Arg, R-Gln, S-Glu

P-Ile, Q-Glu, R-Lys, S-Arg

P-Asn, Q-Asp, R-Arg, S-Lys

P-His, Q-Glu, R-Gln, S-Lys

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A pedigree of an inheritable disease is shown below.

What type of inheritance does the disease follow?

Your answerChoose one option.

Autosomal dominant

X-linked dominant

X-linked recessive

Autosomal recessive

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Match the industrial products mentioned in Group I with their producer organisms in Group II

Group I P. Citric acid Q. Cellulase R. Vitamin B₁₂ S. Butanol

Group II

Trichoderma viride

Clostridium acetobutylicum

Aspergillus niger

Propionibacterium freudenreichii

Your answerChoose one option.

P-4, Q-3, R-1, S-2

P-3, Q-1, R-2, S-4

P-2, Q-1, R-4, S-3

P-3, Q-1, R-4, S-2

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5′ capping of mRNA transcripts in eukaryotes involves the following events: P. Addition of GMP on the 5′ end Q. Removal of γ-phosphate of the triphosphate on first base at the 5′ end R. 5′-5′ linkage between GMP and the first base at 5′ end S. Addition of methyl group to N7 position of guanine

Which one of the following is the correct sequence of events?

Your answerChoose one option.

P, Q, R, S

P, R, Q, S

Q, P, R, S

Q, P, S, R

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GATE BT topic:life-sciences PYQs

Question 31

Question 32

Question 33

Question 34

Question 35

Question 36

Question 37

Question 38

Question 39

Question 40