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Question
What is the correct order of the stages of cellular respiration?
What is the correct order of the stages of cellular respiration?
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Solution
The correct option is C Glycolysis - Krebs cycle - Electron transport chain
The breaking of the C−C bonds of complex compounds through oxidation within the cells, leading to the release of a considerable amount of energy is called respiration. Since this process occurs in the cell, it is called cellular respiration. It is a multistep process that starts with the breaking down of glucose to form a three carbon pyruvate molecule. This stage is known as glycolysis. Glycolysis takes place in the cytoplasm.
Further the pyruvate is converted into a two carbon acetyl CoA. This stage is known as oxidative decarboxylation.
The two carbon compound
(acetyl CoA) enters into the next step of cellular respiration called the Krebs cycle. The Krebs cycle is involved in the production of NADH and FADH2. Kreb cycle takes place in the mitochondria.
These energy molecules i.e., NADH and FADH2 enter into the next stage of cellular respiration called the electron transport chain.
The final stage of the cellular respiration is called oxidative phosphorylation. In this stage the ATP molecules are synthesized.
Thus the correct order of the stages in cellular respiration is:
Glycolysis - Oxidative decarboxylation - Krebs cycle - Electron transport chain - Oxidative phosphorylation.
The breaking of the C−C bonds of complex compounds through oxidation within the cells, leading to the release of a considerable amount of energy is called respiration. Since this process occurs in the cell, it is called cellular respiration. It is a multistep process that starts with the breaking down of glucose to form a three carbon pyruvate molecule. This stage is known as glycolysis. Glycolysis takes place in the cytoplasm.
Further the pyruvate is converted into a two carbon acetyl CoA. This stage is known as oxidative decarboxylation.
The two carbon compound
(acetyl CoA) enters into the next step of cellular respiration called the Krebs cycle. The Krebs cycle is involved in the production of NADH and FADH2. Kreb cycle takes place in the mitochondria.
These energy molecules i.e., NADH and FADH2 enter into the next stage of cellular respiration called the electron transport chain.
The final stage of the cellular respiration is called oxidative phosphorylation. In this stage the ATP molecules are synthesized.
Thus the correct order of the stages in cellular respiration is:
Glycolysis - Oxidative decarboxylation - Krebs cycle - Electron transport chain - Oxidative phosphorylation.
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