GATE XL exam:gate PYQs & Answers — Page 68

Questions 671–680 of 1235. Imported answers require independent review unless marked reviewed.

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?

Your answerSelect all correct options. You can choose more than one.

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?

Your answerSelect all correct options. You can choose more than one.

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?

Your answerSelect all correct options. You can choose more than one.

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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In a diploid plant species, the T allele produces tall individuals and is completely dominant over the t allele that produces short individuals. Similarly, the W allele produces round seeds and is completely dominant over the w allele that produces wrinkled seeds (assume T and W loci are not linked). If a parent with TTWW genotype is crossed to another parent with ttww genotype, the fraction of the F₂ population produced by the fusion of both recombinant gametes would be ________. (Round-off to two decimal places.)

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In a population of a diploid plant species obeying Hardy-Weinberg equilibrium, a locus regulating flower color has two alleles R and r. Individuals with RR, Rr and rr genotypes produce red, pink and white flowers, respectively. If the ratio of red, pink and white flower-producing individuals in the population is 6:3:1, then the frequency of r allele in the population would be ______%. (Round-off to two decimal places.)

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Antonie van Leeuwenhoek observed several microscopic organisms under his hand-made microscope. He described them as

Your answerChoose one option.

Bacteria.

Fungi.

Animalcules.

Bacteriophages.

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Which ONE of the following pathways oxidizes 1 mole of glucose to 2 moles of pyruvic acid along with one mole each of ATP, NADH and NADPH, in Pseudomonas spp., but not in Bacillus spp.?

Your answerChoose one option.

Gluconeogenesis

Embden-Meyerhof Pathway (EMP)

Enter-Doudoroff (ED) Pathway

Pentose Phosphate Pathway (PPP)

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Water balance in extreme halophiles such as Halobacterium is maintained by cell surface glycoproteins consisting of

Your answerChoose one option.

glycine and lysine.

lysine and histidine.

glycine.

aspartate and glutamate.

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Nocardia spp. are not amenable to the classical method of Gram staining due to the presence of

Your answerChoose one option.

N-acetylasaminuronic acid in the cell wall.

thick peptidoglycan.

mycolic acid.

keto-deoxy-octulosonic acid.

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Protists belonging to the genus Trichonympha thrive in the gut of termites. They help the termites use wood as a food source. This relationship is an example of

Your answerChoose one option.

parasitism.

competition.

commensalism.

mutualism.

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GATE XL exam:gate PYQs

Question 16

Question 17

Question 18

Question 19

Question 20

Question 1

Question 2

Question 3

Question 4

Question 5