GATE ES topic:microbial-metabolism PYQs & Answers

Questions 1–10 of 10. Imported answers require independent review unless marked reviewed.

The major class of enzymes catalysing the cleavage of

, or other bonds by elimination, leaving double bonds or rings, or addition of groups to double bonds in any biochemical reactions is _____.

Your answerChoose one option.

lyases

transferases

oxidoreductases

hydrolases

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Consider the following statements on microbial metabolism (i) Utilization of carbon for cell synthesis is termed as anabolism. (ii) During catabolism, adenosine triphosphate (ATP) is converted into adenosine diphosphate (ADP). Choose the correct option from the following

Your answerChoose one option.

(i) and (ii) are correct

(i) and (ii) are incorrect

(i) is correct and (ii) is incorrect

(i) is incorrect and (ii) is correct

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Aerobic biomass has yield coefficient value of 0.4 for glucose (molecular weight = 180 g/mole) substrate. Bacteria is represented as

(molecular weight = 113 g/mole). Assume that no endogenous respiration occurs. The percentage of carbon going into

from 1 mole/L glucose is __________. (rounded off to two decimal places)

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Enzymes with the class of enzymes are listed in the table.

Enzyme	Class of Enzyme
(a) Lactate dehydrogenase	(i) Isomerases
(b) Alanine racemase	(ii) Transferases
(c) Lipase	(iii) Oxidoreductases
(d) Hexokinase	(iv) Hydrolases

Select the correct match(es)

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

(a) - (iii); (b) - (i)

(a) - (ii); (b) - (iv)

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Read the following statements

I. Photosynthesis takes place within the chloroplasts of the eukaryotes, where the breakdown of complex molecules to yield energy takes place in the cytoplasm and in the mitochondria.

II. Photosynthesis takes place within the chloroplasts of the prokaryotes, where the breakdown of complex molecules to yield energy takes place in the cytoplasm and in the mitochondria.

III. All living organisms retain the enzymatic machinery to partially oxidise glucose without the help of oxygen. This breakdown of glucose to pyruvic acid is called glycolysis.

IV. All living organisms retain the enzymatic machinery to completely oxidise glycerol without the help of oxygen. This breakdown of glycerol to citric acid is called glycolysis.

The correct choice is

Your answerChoose one option.

I and III are correct

II and IV are correct

I is correct whereas III is incorrect

II is correct whereas IV is incorrect

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The ratio of the moles of CO₂ evolved to the moles of O₂ consumed in respiration also called the respiratory quotient, is calculated for a carbohydrate (C₆H₁₂O₆) as substrate and found to be 1. Under similar conditions, for a fatty acid (C₅₁H₉₈O₆) as substrate, the respiratory quotient is _________ (rounded off to two decimal place).

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Which one of the following statements is NOT correct?

Your answerChoose one option.

Photophosphorylation is the synthesis of ATP from ADP and inorganic phosphate in the presence of light.

The process through which ATP is synthesised by cells (in mitochondria and chloroplasts) is called phosphorylation.

The Calvin cycle (carboxylation, reduction, and regeneration) occurs in all photosynthetic plants (C3, C4 or any other).

C3 plants have a special type of leaf anatomy, they tolerate higher temperatures, they show a response to high light intensities, have high rate of photosynthesis and reduced rate of photorespiration as compared to C4 plants.

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Read the following statements

i. In endogenous metabolism by aerobic bacteria, electron acceptor is present inside the cells.

ii. In endogenous metabolism by aerobic bacteria, electron acceptor is dissolved oxygen.

iii. The endogenous metabolism is linked to fermentative metabolism.

iv. In exogenous metabolism by aerobic bacteria, enzyme mediated electron transfer happens within the cells.

The correct choice is

Your answerChoose one option.

(i) is correct; (ii) is correct

(ii) is correct; (iii) is incorrect

(iii) is incorrect; (iv) is incorrect

(iii) is correct; (iv) is correct

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Which of the following is the terminal electron acceptor in the electron transport chain of aerobic respiration?

Your answerChoose one option.

Water

NADH

O₂

Cytochrome-c

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Which of the following is/are correct for the process of glycolysis?

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

There is net decrease in standard Gibbs free energy.

The end product is glyceraldehyde 3-phosphate.

First phase includes the phosphorylation of the glucose molecule.

It results in the net gain of NADH.

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GATE ES topic:microbial-metabolism PYQs

How to practice topic:microbial-metabolism

Question 17

Question 38

Question 51

Question 43

Question 15

Question 32

Question 37

Question 39

Question 8

Question 38