GATE XL format:msq PYQs & Answers — Page 17

Questions 161–170 of 179. Imported answers require independent review unless marked reviewed.

Topic practice 179 questionsPage 17 of 18

In the plot given below, the solid line represents oxygen binding to hemoglobin under physiological conditions. The broken line represents the condition(s) of

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High CO₂ concentration

Increase in 2,3- Bisphosphoglycerate concentration

High pH

Loss of cooperativity

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Considering the open chain forms, which of the following pair(s) represent/s an epimer?

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D-mannose and D-fructose

D-glucose and D-mannose

D-glucose and D-fructose

D-galactose and D-glucose

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Which of the following cellular component(s) is/are NOT part(s) of cytoskeleton in Angiosperms?

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Microtubules

Microfilaments

Intermediate filaments

Centrioles

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Which of the following enzyme(s), when overexpressed, would result in rice grains with increased β-carotene content?

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Phytoene synthase

Carotene desaturase

β-glucuronidase

Enolpyruvishikimate-3-phosphate synthase (EPSPS)

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To understand the mechanism of systemic acquired resistance (SAR), a team of researchers isolated a mutant with reduced SAR response. Sequencing of this mutant revealed homozygous mutations in two genes, X and Y. Which of the following experiment(s) would test whether the mutant phenotype is caused by mutation in either or both the genes?

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Complement the mutant with X or Y and analyze the phenotype in each case.

Complement the mutant with both X and Y and analyze the phenotype.

Cross the mutant with wild-type and analyze the segregation pattern of the phenotype.

Compare the expression of X and Y in mutant and wild-type plants.

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The observations of an experiment on seed germination in various genotypes under different light conditions are given, where √ and X indicate germination and the lack of it, respectively.

Genotype	Blue	Red	Far-red	White	Dark
Wild-type	√	√	√	√	X
cry1 mutant	X	√	√	√	X
phyA mutant	√	√	X	√	X
phyB mutant	√	X	√	√	X
vp1 mutant	√	√	√	√	√

Based on these observations, which of the following option(s) is/are CORRECT?

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All the three light qualities – blue, red and far-red – are required for seed germination.

Any one of the three light qualities – blue, red and far-red – is sufficient to induce seed germination.

The CRY1, phyA and phyB proteins are required for blue, red and far-red light perception, respectively.

The VP1 protein is unlikely to be involved in light perception.

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Which of the following option(s) is/are CORRECT in the context of hybrid plant generation using Barnase/Barstar-based male sterile lines?

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Banase inhibits Barstar.

Barstar inhibits Banase.

Banase and Barstar are used to generate the male sterile line and the restorer line, respectively.

Banase and Barstar are used to generate the restorer line and the male sterile line, respectively.

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Which of the following is/are used as electron donor/s for CO₂ reduction during photosynthesis in purple sulfur bacteria?

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Hydrogen sulfide

Thiosulfates

Methane

Sulfates

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Which of the following catalyze(s) substrate-level phosphorylation?

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ATP synthase

Succinate thiokinase

Phosphofuctokinase

Pyruvate kinase

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Which of the following method(s) can be applied to identify a bacterial species?

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Fluorescent in situ hybridization (FISH)

Polymerase chain reaction (PCR) followed by sequencing of the amplicon

Gram staining

Acid-fast staining

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GATE XL format:msq PYQs

Question 19

Question 20

Question 8

Question 9

Question 16

Question 17

Question 18

Question 6

Question 7

Question 8