GATE XL Microbial Metabolism PYQs & Answers — Page 3

Questions 21–25 of 25. 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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The following stoichiometric equation represents the conversion of glucose to lactic acid in a cell: Glucose + 2Pi + 2ADP → 2Lactate + 2ATP + 2H₂O If the free energy of conversion of glucose to lactic acid alone is ΔG⁰ = −4700 cal/mol, the efficiency of energy transfer is ______ % (up to 1 decimal point). (ΔG⁰ for ATP hydrolysis is −7.3 kcal/mol)

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Which one of the following is the end product of dissimilatory sulfate reduction by sulfate reducing bacteria?

Your answerChoose one option.

Hydrogen sulfide

Sulfur dioxide

Sulfur

Thiosulfate

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Which one of the following is the terminal electron acceptor in the given metabolic reaction catalyzed by methanogens?

Your answerChoose one option.

H₂

CO₂

CH₄

H₂O

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Match the terms given in Group I with the descriptions from Group II.

Group I (P) Photoautotrophs (Q) Chemoautotrophs (R) Photoheterotrophs (S) Chemoheterotrophs

Group II (I) Use inorganic chemical reactions for energy production (II) Use organic compounds for energy production (III) Use sunlight as energy source and carbon dioxide as carbon source (IV) Use sunlight as energy source and organic compounds as carbon source

Your answerChoose one option.

P-II, Q-I, R-IV, S-III

P-III, Q-I, R-IV, S-II

P-IV, Q-III, R-I, S-II

P-II, Q-IV, R-III, S-I

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GATE XL Microbial Metabolism PYQs

Question 14

Question 20

Question 56

Question 57

Question 70