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Test: Krebs Cycle (Aerobic Respiration) - NEET MCQ


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

Test: Krebs Cycle (Aerobic Respiration) for NEET 2024 is part of Biology Class 11 preparation. The Test: Krebs Cycle (Aerobic Respiration) questions and answers have been prepared according to the NEET exam syllabus.The Test: Krebs Cycle (Aerobic Respiration) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Krebs Cycle (Aerobic Respiration) below.
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Test: Krebs Cycle (Aerobic Respiration) - Question 1

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

Detailed Solution for Test: Krebs Cycle (Aerobic Respiration) - Question 1

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.

Test: Krebs Cycle (Aerobic Respiration) - Question 2

In one Krebs’ cycle, decarboxylation takes place at _______ steps.

Detailed Solution for Test: Krebs Cycle (Aerobic Respiration) - Question 2

Krebs’ cycle is the central pathway for the metabolism of carbohydrates, fats, and proteins. It begins with a citric acid molecule which is a 6- carbon compound and ends at Oxaloacetate which is a 4-carbon compound which indicates the removal of two carboxyl groups.
These carboxyl groups are removed with the release of a CO2 molecule in two different steps.

- The first oxidative decarboxylation takes place at the fourth step of the TCA cycle where isocitrate is converted to 5-carbon α-ketoglutarate, with the release of a pair of hydrogen atoms and a molecule of carbon dioxide.

- The second oxidative decarboxylation occurs at the fifth step of the Krebs’ cycle where a molecule of coenzyme-A reacts with the α-ketoglutarate to form a 4-carbon compound succinyl- coenzyme A and releasing carbon dioxide and a pair of hydrogen atoms.

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Test: Krebs Cycle (Aerobic Respiration) - Question 3

The TCA cycle is named after

Detailed Solution for Test: Krebs Cycle (Aerobic Respiration) - Question 3

The TCA cycle, also known as the Krebs cycle or tricarboxylic acid cycle, has been named after the German biochemist Sir Hans Krebs who discovered the cycle in 1937 in England.

Test: Krebs Cycle (Aerobic Respiration) - Question 4

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

Detailed Solution for Test: Krebs Cycle (Aerobic Respiration) - Question 4

Tricarboxylic acid cycle or the citric acid cycle or the Krebs cycle takes place within the mitochondrial matrix of the cell. The end product of Krebs cycle is 2 GTP, 6 NADH and 4 carbon dioxide.

Test: Krebs Cycle (Aerobic Respiration) - Question 5

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

Detailed Solution for Test: Krebs Cycle (Aerobic Respiration) - Question 5

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. 

Test: Krebs Cycle (Aerobic Respiration) - Question 6

End-product of citric acid/Krebs cycle is​

Detailed Solution for Test: Krebs Cycle (Aerobic Respiration) - Question 6

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.'

Test: Krebs Cycle (Aerobic Respiration) - Question 7

Choose the correct statement.

Detailed Solution for Test: Krebs Cycle (Aerobic Respiration) - Question 7
  • 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'.

Test: Krebs Cycle (Aerobic Respiration) - Question 8

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

Detailed Solution for Test: Krebs Cycle (Aerobic Respiration) - Question 8

Acetyl CoA is the key intermediate between the Krebs cycle of glycolysis. After glycolysis, the glucose converts to pyruvic acid which is a three-carbon molecule. It is converted into acetyl coenzyme a by oxidative decarboxylation This, Acetyl CoA enters the Krebs cycle and along with oxaloacetic acid forms the citric acid which is a 6C compound.

Test: Krebs Cycle (Aerobic Respiration) - Question 9

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

Detailed Solution for Test: Krebs Cycle (Aerobic Respiration) - Question 9
  1. Krebs cycle is also known as the citric acid cycle because this reaction starts with the six-carbon compound which is citric acid. It occurs in the mitochondrial matrix.
  2. Krebs cycle is a closed-loop cycle. And each loop of the cycle generates a molecule of ATP. This cycle consists of eight steps which include redox, dehydration, hydration, and decarboxylation reactions. It is an aerobic pathway because NADH is produced and the electrons released are used up in the next cycle which uses oxygen.
  3. The process of the cycle starts with the condensation of acetyl- CoA with oxaloacetate.
  4. This reaction is controlled by the amount of ATP present.
  5. If the ATP level increases then the rate of the reaction decreases and vice versa. After glycolysis, the pyruvate is then converted into acetyl CoA which enters the citric acid cycle.
  6. The Krebs cycle is the pathway that all organisms use to generate energy. The intermediate compound that links pyruvate to the Krebs cycle is Acetyl CoA.
  7. So, the answer is option (B) ‘the intermediate compound which links glycolysis with the Krebs cycle is malic acid’.
Test: Krebs Cycle (Aerobic Respiration) - Question 10

Most of the enzymes of the TCA cycle are present in

Detailed Solution for Test: Krebs Cycle (Aerobic Respiration) - Question 10
Mitochondria except succinate dehydrogenase.
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