GATE XL format:mcq PYQs & Answers — Page 34

Questions 331–340 of 812. Imported answers require independent review unless marked reviewed.

Which one of the following organic compounds is composed of only (i) a nitrogen containing base, (ii) a single five-carbon sugar, and (iii) a triphosphate?

Your answerChoose one option.

Nucleoside

Nucleotide

Base

Nucleic acid

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Which one of the following animals develops adaptive predator avoidance morphology because of the presence of high predator number in its habitat?

Your answerChoose one option.

Daphnia sp.

Scaphopus sp.

Wolbachia sp.

Rhodnius sp.

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To which class of Drosophila development genes does fushi tarazu (ftz) belong?

Your answerChoose one option.

Gap genes

Segment polarity genes

Pair rule genes

Maternal effect genes

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The action of which class of enzyme inhibitors can be reversed by adding an excess of substrate?

Your answerChoose one option.

Uncompetitive inhibitors

Competitive inhibitors

Non-specific inhibitors

Allosteric inhibitors

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Mendel deduced the genetic principle of inheritance by experimenting on sweet pea plants. One of the experiments involved crossing plants with two contrasting characters, tall (dominant) and dwarf (recessive), which yielded all tall plants in the first generation. When the same genetic cross was independently repeated by a researcher, only short plants were obtained. Which one of the following can possibly explain the altered outcome?

Your answerChoose one option.

Tall plants were heterozygous

An enhancer for the tall allele is present in the dwarf plant

A suppressor for the tall allele is present in the dwarf plant

Dwarf plants are homozygous

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Match the drug/chemicals listed in Column I with the developmental/physiological defects listed in Column II.

Column I P. Veratrum alkaloids Q. Thalidomide R. Methylmercury S. Diethylstilbesterol

Column II (i) Obesity (ii) Minamata syndrome (iii) Cyclopia (iv) Phocomelia

Your answerChoose one option.

P-(ii); Q-(iv); R-(ii); S-(i)

P-(i); Q-(iv); R-(iii); S-(ii)

P-(ii); Q-(iv); R-(ii); S-(i)

P-(ii); Q-(iii); R-(iv); S-(i)

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Match the animals listed in Column I with primary tissue or organ of residence in the host listed in Column II.

Column I: P. Ascaris lumbricoides Q. Dracunculus medinensis R. Enterobius vermicularis S. Wuchereria bancrofti

Column II: (i) Subcutaneous tissue in human (ii) Lymphatic vessels and lymph nodes (iii) Small intestine (iv) Caecum or vermiform appendix

Your answerChoose one option.

P-(ii), Q-(iv), R-(ii), S-(i)

P-(i), Q-(iv), R-(iii), S-(ii)

P-(ii), Q-(iii), R-(iv), S-(i)

P-(iii), Q-(i), R-(iv), S-(ii)

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Match the cell types listed in Column I with their sources in Column II and the primary functional roles listed in Column III.

Column I: P. Microglial cells Q. Leydig cells R. ON cells S. Pneumocytes

Column II: (i) Lung (ii) Eyes (iii) Brain (iv) Testis

Column III: a. Visual transduction b. Hormone secretion c. Phagocytosis d. Gaseous exchange

Your answerChoose one option.

P-(iii)-b, Q-(iv)-c, R-(ii)-a, S-(i)-d

P-(ii)-c, Q-(iv)-d, R-(i)-a, S-(iii)-b

P-(i)-a, Q-(iv)-b, R-(ii)-c, S-(iii)-d

P-(iii)-c, Q-(iv)-b, R-(ii)-a, S-(i)-d

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Match the ecological concepts listed in Column I with their definitions listed in Column II.

Column I: P. Dominance hierarchies Q. Territory R. Altruism S. Kin selection

Column II: (i) Giving up one’s own reproductive potential to benefit another individual (ii) Selection acting on related animals which affects fitness of an individual (iii) Exclusion of competing individuals using agonistic behavior (iv) Preferential access to the food and mates in a group

Your answerChoose one option.

P-(ii), Q-(iv), R-(i), S-(iii)

P-(iv), Q-(ii), R-(i), S-(ii)

P-(ii), Q-(iv), R-(i), S-(ii)

P-(i), Q-(iv), R-(iii), S-(ii)

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Match the hormones listed in Column I with their primary source tissues in Column II and the primary target tissues listed in Column III.

Column I: P. Epinephrine; Q. Prolactin; R. Calcitonin; S. Thyrotropin releasing hormone

Column II: (i) Hypothalamus; (ii) Thyroid; (iii) Pituitary; (iv) Chromaffin tissue

Column III: a. Pituitary; b. Heart; c. Bone; d. Pigeon’s crop

Your answerChoose one option.

P-(ii)-b, Q-(iv)-c, R-(ii)-a, S-(i)-d

P-(iv)-c, Q-(iii)-b, R-(ii)-a, S-(i)-d

P-(iv)-b, Q-(ii)-d, R-(ii)-c, S-(i)-a

P-(iii)-b, Q-(iv)-c, R-(ii)-d, S-(i)-a

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GATE XL format:mcq PYQs

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