Question:
Which of these statements is incorrect?
Which of these statements is incorrect?
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All components of the Electron Transport Chain (Complex I-IV) and the ATP synthase complex (Complex V) are embedded in the inner mitochondrial membrane. The outer membrane is mainly a protective boundary containing channel proteins.
Updated On: Aug 5, 2026
- Glycolysis occurs in cytosol
- Oxidative phosphorylation takes place in outer mitochondrial membrane
- Respiratory ETS in plants located in inner mitochondrial membrane
- ATP is synthesized through complex V
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Cellular respiration is divided into distinct stages, each occurring in a specific compartment of the cell.
This spatial organization is essential for maintaining the proton gradients required for ATP synthesis.
Step 2: Detailed Explanation:
Let us evaluate each of the statements to identify the incorrect one:
- Statement A: "Glycolysis occurs in cytosol."
This is correct.
All ten steps of the glycolytic pathway, which break down glucose into pyruvate, take place in the cytosol of the cell.
- Statement B: "Oxidative phosphorylation takes place in outer mitochondrial membrane."
This is incorrect.
Oxidative phosphorylation, which includes electron transport through the respiratory chain and ATP synthesis via chemiosmosis, occurs on the inner mitochondrial membrane, not the outer membrane.
The outer membrane is highly permeable and contains porins, whereas the inner membrane is folded into cristae to provide a large surface area for these respiratory assemblies.
- Statement C: "Respiratory ETS in plants located in inner mitochondrial membrane."
This is correct.
The protein complexes (Complex I to IV) of the Electron Transport System (ETS) are embedded in the inner mitochondrial membrane.
- Statement D: "ATP is synthesized through complex V."
This is correct.
Complex V is the ATP synthase enzyme complex, which uses the proton-motive force generated across the inner membrane to synthesize ATP from ADP and inorganic phosphate.
Step 3: Final Answer:
The correct option is (B).
Cellular respiration is divided into distinct stages, each occurring in a specific compartment of the cell.
This spatial organization is essential for maintaining the proton gradients required for ATP synthesis.
Step 2: Detailed Explanation:
Let us evaluate each of the statements to identify the incorrect one:
- Statement A: "Glycolysis occurs in cytosol."
This is correct.
All ten steps of the glycolytic pathway, which break down glucose into pyruvate, take place in the cytosol of the cell.
- Statement B: "Oxidative phosphorylation takes place in outer mitochondrial membrane."
This is incorrect.
Oxidative phosphorylation, which includes electron transport through the respiratory chain and ATP synthesis via chemiosmosis, occurs on the inner mitochondrial membrane, not the outer membrane.
The outer membrane is highly permeable and contains porins, whereas the inner membrane is folded into cristae to provide a large surface area for these respiratory assemblies.
- Statement C: "Respiratory ETS in plants located in inner mitochondrial membrane."
This is correct.
The protein complexes (Complex I to IV) of the Electron Transport System (ETS) are embedded in the inner mitochondrial membrane.
- Statement D: "ATP is synthesized through complex V."
This is correct.
Complex V is the ATP synthase enzyme complex, which uses the proton-motive force generated across the inner membrane to synthesize ATP from ADP and inorganic phosphate.
Step 3: Final Answer:
The correct option is (B).
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