GATE XL branch:xl PYQs & Answers — Page 69

Questions 681–690 of 1235. Imported answers require independent review unless marked reviewed.

Topic practice 1235 questionsPage 69 of 124

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

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

Hydrogen sulfide

Thiosulfates

Methane

Sulfates

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

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

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?

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

Fluorescent in situ hybridization (FISH)

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

Gram staining

Acid-fast staining

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Which of the following event(s) would contribute to the induction of lac operon in a wild-type strain of E. coli?

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

Accumulation of allolactose in the cell

Direct binding of cAMP to the promoter DNA

Binding of cAMP to a specific protein leading to its interaction with the promoter

Elimination of cAMP from the cell

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One mole of a circular bacterial plasmid was digested with a high-fidelity restriction enzyme. The plasmid has five restriction sites for the enzyme used. The number of moles of fragments released upon cleavage at all sites is ________.

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Under anaerobic fermentative growth conditions, one mole of glucose yields 22 grams of Streptococcus faecalis or 8.6 grams of Zymomonas mobilis. The molar growth yield (YATP) for (i) S. faecalis and (ii) Z. mobilis will be

Your answerChoose one option.

(i) 11 and (ii) 4.3

(i) 22 and (ii) 4.3

(i) 22 and (ii) 8.6

(i) 11 and (ii) 8.6

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The order of abundance of quinones (ubiquinone [UQ], menaquinone [MQ] and demethylmenaquinone [DMQ]) in E. coli growing anaerobically on fumarate is

Your answerChoose one option.

UQ > DMQ > MQ

MQ > DMQ > UQ

MQ = DMQ > UQ

MQ > UQ > DMQ

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What is the number of ATPs generated per molecule of NADH during oxidative phosphorylation in E. coli via (i) NDH-1 and cytochrome bo complex or (ii) the NDH-2 and cytochrome bd complex? (Assume H⁺/ATP = 3)

Your answerChoose one option.

(i) 2.00 and (ii) 3.67

(i) 3.00 and (ii) 2.67

(i) 2.70 and (ii) 0.67

(i) 2.50 and (ii) 0.50

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Match the Immunoglobulin classes with their function

Immunoglobulin Function (i) IgE (p) protects the fetus (ii) IgG (q) first antibody to be produced in response to infection (iii) IgM (r) provides localized protection of mucosal surfaces (iv) IgA (s) mediates allergic reaction (t) directly lyses the target cells

Your answerChoose one option.

(i)-(s), (ii)-(p), (iii)-(q), (iv)-(r)

(i)-(p), (ii)-(t), (iii)-(q), (iv)-(r)

(i)-(q), (ii)-(p), (iii)-(t), (iv)-(r)

(i)-(r), (ii)-(p), (iii)-(t), (iv)-(s)

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The figure shows the profiles of quantitative real-time PCR (qRT-PCR) tests for SARS-CoV-2 conducted on the throat swab samples of three individuals (X, Y and Z). Tests were carried out under identical conditions. Dotted line represents the threshold fluorescent value. Identify the correct statement on the status of the COVID-19 tests of the individuals based on their qRT-PCR profiles.

Your answerChoose one option.

X and Y are negative; Z is positive

X and Y are positive; There is no apparent difference in their viral load

X and Y are positive; X has the highest viral load

X and Y are positive; Y has the highest viral load

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GATE XL branch:xl PYQs

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