GATE XL format:mcq PYQs & Answers — Page 69

Questions 681–690 of 812. Imported answers require independent review unless marked reviewed.

Match the precursors/intermediates with the corresponding metabolic pathways. Precursor/Intermediates: (i) Inosine monophosphate; (ii) Ornithine; (iii) Chorismate; (iv) Homocysteine. Metabolic pathway: (p) L-methionine biosynthesis; (q) L-tryptophan biosynthesis; (r) Purine biosynthesis; (s) L-arginine biosynthesis

Your answerChoose one option.

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

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

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

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

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Match the scientists to their area of major contribution. Scientists: (i) Antonie van Leeuwenhoek; (ii) Carl Linnaeus; (iii) Sir Alexander Fleming; (iv) Louis Pasteur. Area of major contribution: (p) Taxonomy; (q) Antimicrobial agents; (r) Vaccination; (s) Microscopy

Your answerChoose one option.

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

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

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

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

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Which of the following combinations would improve the resolution of a microscope? (i) Increasing the half aperture angle of the objective lens (ii) Decreasing the wavelength of the illumination source (iii) Decreasing the numerical aperture of the objective lens (iv) Decreasing the refractive index of immersion medium

Your answerChoose one option.

(i) and (ii)

(ii) and (iii)

(ii) and (iv)

(i) and (iii)

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Animals belonging to phylum Echinodermata are closer to chordates than other invertebrate phyla. Which ONE of the following reasons can account for this relatedness?

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Highly evolved nervous system

Radially symmetric body plan

Deuterostomic development

Well-developed muscles

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A zoologist recovered some tissue from preserved skin of a woolly mammoth. Further genetic analysis requires DNA isolation and increase its amount. Which ONE of the following techniques would be most useful for increasing the amount of DNA?

Your answerChoose one option.

RFLP analysis

Polymerase chain reaction (PCR)

Electroporation

Chromatography

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In a chemical reaction where the substrate and product are in equilibrium in solution, what will occur if an enzyme is added?

Your answerChoose one option.

The equilibrium of the reaction will not change.

There will be a decrease in product formed.

Additional substrate will be formed.

The free energy of the system will change.

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Tay-Sachs disease is a human genetic disorder that is associated with defects in which ONE of the following cellular organelles?

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Endoplasmic reticulum

Mitochondria

Golgi apparatus

Lysosome

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Increase in the existent population of grey peppered moth, Biston betularia, during industrial revolution in Britain is an example of which ONE of the following evolutionary processes?

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Neutral selection

Disruptive selection

Directional selection

Stabilizing selection

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Which ONE of the following is NOT a characteristic of a cancer cell?

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Increase in cell motility

Loss of contact inhibition

Decrease in apoptosis

Uncontroled meiosis

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Cardiac and cerebral tissues are derived from the following germ layers respectively

Your answerChoose one option.

Ectoderm and mesoderm

Mesoderm and ectoderm

Mesoderm and endoderm

Endoderm and ectoderm

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GATE XL format:mcq PYQs

Question 14

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Question 7