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Match List I with List II. List I: A. Citric acid cycle; B. Glycolysis; C. Electron transport system; D. Proton gradient. List II: I. Cytoplasm; II. Mitochondrial matrix; III. Intermembrane space of mitochondria; IV. Inner mitochondrial membrane. Choose the correct answer from the options given below:
Glycolysis = Cytoplasm (I); Krebs cycle = Mitochondrial matrix (II); ETS = Inner mitochondrial membrane (IV); Proton accumulation = Intermembrane space (III)! Result: A-II, B-I, C-IV, D-III!
Glycolysis takes place in the cytoplasm of the cell and is present in all living organisms (B -> I). The citric acid cycle takes place in the matrix of mitochondria where soluble dehydrogenases reside (A -> II).
The electron transport system (ETS) is embedded in the inner mitochondrial membrane (cristae) (C -> IV). As electrons move through the ETS complexes, protons are pumped from the matrix into the intermembrane space, generating the electrochemical proton gradient driving ATP synthesis via Complex V (D -> III).
A-II, B-I, C-IV, D-III corresponds to Option (4).
Diagnose every choice: Know exactly why the right option works and why distractors fail.
Mismatches Citric acid cycle with Intermembrane space and Glycolysis with Inner membrane.
Mismatches Citric acid cycle with Inner membrane.
Mismatches Citric acid cycle with cytoplasm.
Accurately pairs all four biochemical processes with their specific cellular and organellar subcompartments.
Confusing the site of ETS complexes (inner membrane) with the site of proton accumulation (intermembrane space).
"Glycolysis occurs in the cytoplasm. The TCA cycle occurs in the matrix of mitochondria. Electron transport system is located in the inner mitochondrial membrane. The energy released is used to pump protons into the intermembrane space."
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