GATE XL format:mcq PYQs & Answers — Page 12

Questions 111–120 of 812. Imported answers require independent review unless marked reviewed.

The following table summarizes the flowering time (days to flower) and the transcript levels in four genotypes of a plant species.

Genotype | Days to flower | Transcript level of gene A | Transcript level of gene B Wild type | 30 | Normal | Normal a mutant | 15 | Nil | Increased b mutant | 60 | Normal | Nil ab double mutant | 60 | Nil | Nil

Which one of the following genetic pathways best explains the observations shown in the table?

Your answerChoose one option.

A gene activates B, which suppresses flowering transition

A gene suppresses B, which promotes flowering transition

B gene activates A, which suppresses flowering transition

B gene suppresses A, which promotes flowering transition

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Correctly match the economically important specialized metabolites (Group I) with their broad chemical classes (Group II).

Group I: (P) Azadirachtin; (Q) Saponin; (R) Gallocatechin; (S) Cocaine; (T) Menthol Group II: (1) Monoterpene; (2) Alkaloid; (3) Triterpene glycoside; (4) Polyphenol; (5) Triterpene

Your answerChoose one option.

P-5; Q-3; R-2; S-4; T-1

P-2; Q-4; R-3; S-1; T-5

P-5; Q-3; R-4; S-2; T-1

P-3; Q-5; R-4; S-2; T-1

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Correctly match the following Arabidopsis genes (Group I) and the biological processes they primarily regulate (Group II).

Group I: (P) CLAVATA3; (Q) CONSTANS; (R) SCARECROW; (S) AGAMOUS. Group II: (1) Organ identity in flower; (2) Cell-type specification in root meristem; (3) Meristem size in shoot; (4) Photoperiodic floral transition

Your answerChoose one option.

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

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

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

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

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Correctly match the enzymes used as selectable markers (Group I) and the chemicals used for their selection (Group II).

Group I: (P) Neomycin phosphotransferase; (Q) Phosphinothricin acetyltransferase; (R) Dihydrofolate reductase; (S) 5-Enolpyruvyl shikimate 3-phosphate synthase. Group II: (1) Bialaphos; (2) Kanamycin; (3) Glyphosate; (4) Methotrexate

Your answerChoose one option.

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

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

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

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

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Which one of the following metabolites is associated with bacterial stringent response?

Your answerChoose one option.

Cyclic di-GMP (c-di-GMP)

Guanosine tetraphosphate (ppGpp)

Cyclic-AMP (cAMP)

Cyclic-GMP (cGMP)

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India is aiming to be free of tuberculosis by 2025. One of the key approaches for this program is DOTS. Which one of the following options is the full form of DOTS?

Your answerChoose one option.

Directly observed therapy short-course

Directly observed tuberculosis short-course

District operated therapy system

Directly operated therapy short-course

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Correctly match the bacterial type in Column I with their corresponding environmental niche in Column II.

Column I P. Psychrophile Q. Barophile R. Mesophile S. Halophile

Column II i. Pressure greater than 380 atm ii. Temperature between 15°C and 45°C iii. Temperature below 15°C iv. pH less than 3.0 v. Salt concentration greater than 2M

Your answerChoose one option.

P - iii; Q - i; R - ii; S - v

P - ii; Q - iii; R - i; S - v

P - i; Q - iv; R - iii; S - v

P - v; Q - iii; R - iv; S - i

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Robert Koch used a meat-infused nutrient medium for which one of the following purposes?

Your answerChoose one option.

To grow disease causing microorganisms.

To demonstrate presence of microorganisms in air.

To test the efficiency of sterilization approaches.

To demonstrate antimicrobial activity of soil isolates.

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A penicillin sensitive Escherichia coli population is exposed to a lethal dose (200 μg/ml) of penicillin. Assuming density-independent mortality, which one of the following relationships would describe the number of surviving bacteria (N) over time (T)?

Your answerChoose one option.

Exponential

Linear

Sigmoidal

Parabolic

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A bacterium obtains energy from a chemical source by the oxidation of reduced

, with

as the principal carbon source. Which one of the following nutritional groups does this bacterium belong to?

Your answerChoose one option.

Photoautotroph.

Photoheterotroph.

Chemoautotroph.

Chemoheterotroph.

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GATE XL format:mcq PYQs

Question 58

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Question 71