Test: Krebs Cycle (Aerobic Respiration)

10 Questions MCQ Test Biology Class 11 | Test: Krebs Cycle (Aerobic Respiration)

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Mitochondria are called the powerhouses of the cell. Which of the following observations support this statement?


Mitochondria (singular - Mitochondrion) are known as the powerhouse of the cell because they are responsible for the release of energy from food ,i.e, cellular respiration. This energy is released in the form of ATP (adenosine triphosphate), the energy currency of the cell.

While the cells release 2 ATP, mitochondria releases 34 ATP which adds up to 36 ATP. Since a major portion of the ATP is released by mitochondria, they are called the powerhouse of the cell.

*Multiple options can be correct

Which of the following is essential for the conversion of pyruvic acid to acetyl CoA?



The oxidative Decarboxylation of Pyruvate into Acetyl - CoA involves the presence of at least five cofactors:-

{Mg ions, [TPP], NAD, Lipoic acid & Co-enzyme (Co-A) }


So, option (b), ( c) , ( d) all can be correct.


The TCA cycle is named after


In which of the following do the two names refer to one and the same thing?


Pyruvic acid, the key product of glycolysis, can have many metabolic fates. Under aerobic conditions, it forms​


Pyruvate, the product obtained through glycolysis, gets oxidised with the loss of its carboxy group as CO2, to give acetyl Co-A, under aerobic condition. This acetyl Co-A is further oxidised completely to CO2 + H2O in citric acid cycle. Other options are incorrect as Lactic acid is formed in muscles under anaerobic conditions. Ethanol and CO2 are products of anaerobic respiration in yeast cells. CO2 and H2O are final and complete reaction products released at the end of cellular respiration. 


End-product of citric acid/Krebs cycle is​


Glycolysis produces 2 pyruvate molecules. The pyruvate molecules then forms acetyl CoA and one molecule of carbon dioxide is released. The acetyl-CoA molecules then enters the citric acid cycle. The end product of citric acid cycle is 2 carbon dioxide molecules, 1 GTP, 3 NADH and 1 FADH2. Thus, the correct answer is 'Carbon dioxide + Water.'


Choose the correct statement.

  • Oxygen sits at the end of the electron transport chain, where it accepts electrons, hydrogen and picks up protons to form water.
  • Pyruvate is formed in the cytoplasm.
  • During fermentation glucose is partially broken down by glycolysis.
  • During the conversion of succinyl CoA to succinic acid a molecule of GTP is synthesized.

So, the correct option is 'Oxygen is vital in respiration for removal of hydrogen'.


Which of the following is the key intermediate compound linking glycolysis to the Krebs cycle?


Which of the following is not correct about the Krebs cycle?


Krebs cycle is also known as citric acid cycle or TCA. The intermediate compound which links glycolysis with krebs cycle is acetyl CoA. It occurs in mitochondria. It begins with a six carbon compound i.e., citric acid.


Most of the enzymes of the TCA cycle are present in

Solution: Mitochondria except succinate dehydrogenase.

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