Question Bank for Krebs cycle (Biology)

MCQs on Krebs Cycle

Ques. Kreb’s has been awarded Nobel Prize in 1953 for explaining
(a) Energy forming process in the cell
(b) ATP metabolism
(c) Respiration chain
(d) Oxidation of cytoplasm
Ans: (a)

Ques. The product formed by maleic dehydrogenase is
(a) Maleic acid
(b) Fumaric acid
(c) Oxaloacetic acid
(d) Succinic acid
Ans: (c)

Ques. In presence of TPP and carboxylase, pyruvic acid is transformed into
(a) Acetaldehyde and CO2
(b) Ethyl alcohol and CO2
(c) Citric acid and CO2
(d) None of the above
Ans: (a)

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Ques. Which of the coenzyme is used in acetylation reaction
(a) CoA
(b) FAD
(c) FMN
(d) None of the above
Ans: (a)

Ques. Kreb’s cycle is termed as the aerobic phase of respiration because
(a) It consumes oxygen
(b) Oxygen acts as a catalyst
(c) Aerobic conditions are essential for the continued operation of electron transport system
(d) All the above
Ans: (c)

Ques. Which of the following is not a part of Kreb’s cycle
(a) Dehydrogenation
(b) Acetylation
(c) Oxidative phosphorylation
(d) Decarboxylation
Ans: (c)

Ques. Kreb’s cycle is also known as
(a) Glyoxylate cycle
(b) EMP pathway
(c) Citric acid cycle
(d) Glycolate cycle
Ans: (c)

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Ques. In respiration, pyruvic acid is
(a) Formed only when oxygen is available
(b) One of the product of Kreb’s cycle
(c) Broken down into two carbon fragments and CO2
(d) A result of protein breakdown
Ans: (c)

Ques. Kreb’s cycle starts with the formation of six carbon compounds by reaction between
(a) Maleic acid and acetyl CoA
(b) Succinic acid and pyruvic acid
(c) Fumaric  acid and pyruvic acid
(d) Acetyl CoA and oxaloacetic acid
Ans: (d)

Ques. In which among the following oxidative phosphorylation occurs during electron transport
(a) Chloroplast
(b) Ribosomes
(c) Mitochondria
(d) Glyoxysomes
Ans: (c)

Ques. Largest amount of phosphate bond energy is produced in the process of respiration during
(a) Anaerobic respiration
(b) Glycolysis
(c) Kreb’s cycle
(d) None of the above
Ans: (c)

Ques. In Kreb’s cycle the hydrogen atoms removed at succinate level are accepted by
(a) FAD
(b) ADP
(c) ATP
(d) NAD
Ans: (a)

Ques. The membrane bound enzyme involved in Kreb’s cycle is
(a) Malate dehydrogenase
(b) Fumarase
(c) cis acotinase
(d) Succinic dehydrogenase
Ans: (d)

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Ques. Biological oxidation in Kreb’s cycle involves
(a) N2
(b) CO2
(c) O2
(d) SO2
Ans: (c)

Ques. Kreb’s cycle involves the formation of
(a) Lactic acid from glucose
(b) Change of pyruvic acid to energy transformation
(c) Pyruvic acid from glucose
(d) ATP from ADP
Ans: (b)

Ques. Kreb’s cycle begins with
(a) Pyruvic acid
(b) Hydrochloric acid
(c) Corticosteroids
(d) Lysine
Ans: (a)

Ques. Kreb’s cycle takes place in
(a) Chloroplast
(b) Peroxisomes
(c) Mitochondria
(d) Cytoplasm
Ans: (c)

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Ques. Kreb’s cycle is also called
(a) TCA cycle
(b) Citric acid cycle
(c) Tricarboxylic cycle
(d) All the above
Ans: (d)

Ques. Which of the following is produced during Kreb’s cycle
(a) Citric acid
(b) Lactic acid
(c) Acetyl coenzyme–A
(d) Acetic acid
Ans: (a)

Ques. Which transfer electrons in E.T.S. (electron transport system)
(a) Phytochrome
(b) F1 particles
(c) Fe – S
(d) Cytochrome
Ans: (c)

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Ques. Kreb’s cycle is found in
(a) Anaerobic respiration
(b) Photorespiration
(c) Photosynthesis
(d) Aerobic respiration
Ans: (d)

Ques. Which of the following is not an intermediate of Kreb’s cycle
(a) Acetyl Co-A
(b) Citric acid
(c) Succinic acid
(d) Lactic acid
Ans: (d)

Ques. Which can accept a hydride ion during electron transduction system?
(b) FAD+, NADP+
(c) FAD+, NADH
(d) FADH, NAD+
Ans: (b)

Ques. Which of the following is important in electron transport system
(a) Ubiquinone
(b) Acetyl CoA
(c) Tricarboxylic acid
(d) Ferricyanide
Ans: (a)

Ques. Kreb’s cycle is also called as :
(a) Tricarboxylic acid cycle
(b) Oxidative phosphorylation
(c) EMP pathway
(d) Glycolysis
Ans: (a)

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Ques. Enzymes of oxydative phosphorylation found in
(a) Endoplasmic reticulum
(b) Chloroplast
(c) Mitochondria
(d) Golgi complex
Ans: (c)

Ques. Oxidative phosphorylation and photophosphorylation both require the electron carrier
(a) Cytochrome
(b) Oxygen
(c) Carbon dioxide
(d) Water
Ans: (a)

Ques. The cycle in which pyruvic acid is broken down in presence of oxygen is known as
(a) Glycolysis
(b) Kreb’s cycle
(c) Anaerobic respiration
(d) None of the above
Ans: (b)

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Ques. In ATP molecule energy is stored in
(a) Chemical bonds
(b) Hydrogen bonds
(c) Carbon bonds
(d) Pyrophosphate bonds
Ans: (d)

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Richa Bhardwaj

Richa (B. Tech) has keen interest in Science and loves to teach students about it through lectures and assignments. She always try to use simple language and sentences while writing to make sure learner understands everything properly.