Fermentation, Respiration and Photosynthesis - Microbial Metabolism - Life Sciences Previous Year Questions

1

2008 · Life Sciences · Microbial Metabolism · Fermentation, Respiration and Photosynthesis

Life Sciences (XL) 2008

Match the products in group 1 with their producer organisms given in group 2. Group 1 (P) Ethanol (Q) L-Lysine (R) Biopesticide (S) Vancomycin Group 2 1. Streptomyces orientalis 2. Saccharomyces cerevisiae 3. Corynebacterium glutamicum 4. Bacillus thuringiensis

A

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

B

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

C

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

D

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

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2

2008 · Life Sciences · Microbial Metabolism · Fermentation, Respiration and Photosynthesis

Life Sciences (XL) 2008

A bacterial culture with an approximate biomass composition of CH1.8O0.5N0.2 is grown aerobically on a defined medium containing glucose as the sole carbon source and ammonia being the nitrogen source. In this fermentation, biomass is formed with a yield coefficient of 0.35 gram dry cell weight per gram of glucose and acetate is produced with a yield coefficient of 0.1 gram acetate per gram of glucose. The respiratory coefficient for the above culture will be

A

0.90

B

0.95

C

1.00

D

1.05

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3

2009 · Life Sciences · Microbial Metabolism · Fermentation, Respiration and Photosynthesis

Life Sciences (XL) 2009

A wild type strain of E. coli growing on a mixture of glucose and acetate shows a typical biphasic diauxic growth. A mutant strain was isolated and was found not to exhibit the second phase of diauxic growth. This mutant is likely to be defective in

A

Pyruvate decarboxylase

B

Isocitrate lyase

C

Glucose-6-phosphate dehydrogenase

D

Phosphoglucose isomerase

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4

2010 · Life Sciences · Microbial Metabolism · Fermentation, Respiration and Photosynthesis

Life Sciences (XL) 2010

Match the microorganism in Group I with the application in Group II
Group I
P. Aspergillus oryzae
Q. Brevibacterium flavum
R. Thiobacillus ferrooxidans
S. Saccharomyces cerevisiae
T. Rhizobium meliloti
Group II
1. Metal ore leaching
2. Glucoamylase producer
3. Bread making
4. Glutamic acid producer
5. Penicillin producer
6. Symbiotic nitrogen fixer

A

P-1, Q-6, R-4, S-5, T-2

B

P-2, Q-4, R-1, S-3, T-6

C

P-4, Q-1, R-6, S-3, T-5

D

P-6, Q-2, R-3, S-5, T-1

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5

2012 · Life Sciences · Microbial Metabolism · Fermentation, Respiration and Photosynthesis

Life Sciences (XL) 2012

Which ONE of the following components is NOT an electron acceptor during anaerobic respiration?

A

Lactate

B

Carbonate

C

Nitrate

D

Sulphate

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6

2012 · Life Sciences · Microbial Metabolism · Fermentation, Respiration and Photosynthesis

Life Sciences (XL) 2012

Methane belched (eructation) out by cattle arises from the carbon dioxide produced

A

during normal respiration

B

oxidation of food stuff occurring in mitochondria

C

lactic acid fermentation occurring in muscles

D

bacterial fermentation occurring in the gut

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7

2013 · Life Sciences · Microbial Metabolism · Fermentation, Respiration and Photosynthesis

Life Sciences (XL) 2013

Which one of the following DO NOT use water as an electron source during photosynthesis?

A

Sulfate reducing bacteria

B

Methanogenic bacteria

C

Green and purple bacteria

D

Nitrifying bacteria

Check answer

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8

2013 · Life Sciences · Microbial Metabolism · Fermentation, Respiration and Photosynthesis

Life Sciences (XL) 2013

How many electrons are accepted when sulfate acts as the terminal electron acceptor in bacteria such as Desulfovibrio?

A

8

B

6

C

4

D

2

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9

2013 · Life Sciences · Microbial Metabolism · Fermentation, Respiration and Photosynthesis

Life Sciences (XL) 2013

An actively growing culture of Acetobacter aceti is added to the vigorously aerated fermented fruit juice medium containing 10 g l⁻¹ ethanol to produce vinegar. After some time, the ethanol concentration in the medium is 0.8 g l⁻¹ and acetic acid produced is 8.4 g l⁻¹. What is the conversion efficiency of the process with respect to theoretical yield?

A

30

B

50

C

70

D

90

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10

2017 · Life Sciences · Microbial Metabolism · Fermentation, Respiration and Photosynthesis

Life Sciences (XL) 2017

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

A

Hydrogen sulfide

B

Sulfur dioxide

C

Sulfur

D

Thiosulfate

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11

2017 · Life Sciences · Microbial Metabolism · Fermentation, Respiration and Photosynthesis

Life Sciences (XL) 2017

Which one of the following is the terminal electron acceptor in the given metabolic reaction catalyzed by methanogens? \(4H_2 + CO_2 \longrightarrow CH_4 + 2H_2O\)

A

H2

B

CO2

C

CH4

D

H2O

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12

2020 · Life Sciences · Microbial Metabolism · Fermentation, Respiration and Photosynthesis

Life Sciences (XL) 2020

Shifting a Saccharomyces cerevisiae culture from fermentative to aerobic respiratory mode will

A

decrease carbon dioxide production

B

increase alcohol production

C

increase glucose consumption

D

decrease ATP generation per mole of glucose

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13

2021 · Life Sciences · Microbial Metabolism · Fermentation, Respiration and Photosynthesis

Life Sciences (XL) 2021

Which ONE of the following pathways oxidizes 1 mole of glucose to 2 moles of pyruvic acid along with one mole each of ATP, NADH and NADPH, in Pseudomonas spp., but not in Bacillus spp.?

A

Gluconeogenesis

B

Embden-Meyerhoff Pathway (EMP)

C

Entner-Doudoroff (ED) Pathway

D

Pentose Phosphate Pathway (PPP)

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14

2021 · Life Sciences · Microbial Metabolism · Fermentation, Respiration and Photosynthesis

Life Sciences (XL) 2021

Which of the following is/are used as electron donor/s for CO₂ reduction during photosynthesis in purple sulfur bacteria?

A

Hydrogen sulfide

B

Thiosulfates

C

Methane

D

Sulfates

Check answer

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15

2021 · Life Sciences · Microbial Metabolism · Fermentation, Respiration and Photosynthesis

Life Sciences (XL) 2021

The order of abundance of quinones (ubiquinone [UQ], menaquinone [MQ] and demethylmenaquinone [DMQ]) in E. coli growing anaerobically on fumarate is

A

UQ > DMQ > MQ

B

MQ > DMQ > UQ

C

MQ = DMQ > UQ

D

MQ > UQ > DMQ

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16

2023 · Life Sciences · Microbial Metabolism · Fermentation, Respiration and Photosynthesis

Life Sciences (XL) 2023

Which one of the following converts sulfate to hydrogen sulfide?

A

Beggiatoa

B

Desulfovibrio

C

Thiobacillus

D

Thiothrix

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17

2023 · Life Sciences · Microbial Metabolism · Fermentation, Respiration and Photosynthesis

Life Sciences (XL) 2023

Some of the industrial products are produced by fermentation processes. Identify the correct pair of product and fermentative microorganism.

A

Vinegar - Acetobacter aceti

B

Citric acid - Enterbacter aerogenes

C

Ethanol - Saccharomyces cerevisiae

D

L-Lysine - Aspergillus niger

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18

2024 · Life Sciences · Microbial Metabolism · Fermentation, Respiration and Photosynthesis

Life Sciences (XL) 2024

Urease enzyme catalyzes the conversion of urea into ammonia and carbon dioxide. Which one of the following organisms expresses urease enzyme?

A

Caenorhabditis elegans

B

Drosophila melanogaster

C

Helicobacter pylori

D

Homo sapiens

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