Question

Match List I with List II:

List I		List II
A	Citric acid cycle	I	Cytoplasm
B	Glycolysis	II	Mitochondrial matrix
C	Electron transport System	III	Intermembrane space of mitochondria
D	Proton gradient	IV	Inner mitochondrial membrane

Choose the correct answer from the options given below:

• A. A-I, B-II, C-III, D-IV
• B. A-II, B-I, C-IV, D-III
• C. A-III, B-IV, C-I, D-II
• D. A-IV, B-III, C-II, D-I

Answer 1

The Correct Option is B

- The Citric acid cycle (Krebs cycle) occurs in the mitochondrial matrix where acetyl-CoA is oxidized to produce ATP, NADH, and FADH$_2$. 
- Glycolysis takes place in the cytoplasm of the cell, where glucose is broken down into pyruvate, generating ATP and NADH in the process. 
- The Electron transport system is located on the inner mitochondrial membrane, where the NADH and FADH$_2$ generated from previous processes donate electrons, which are transferred through protein complexes, generating a proton gradient across the membrane. 
- The Proton gradient is found in the intermembrane space of mitochondria, as protons are pumped into this space during the electron transport, creating a gradient that drives ATP synthesis through ATP synthase.