Match List-I (Process) with List-II (Location):

**List-I**
A. Glycolysis
B. ETS
C. Accumulation of protons
D. Krebs' cycle

**List-II**
I. Inner mitochondrial membrane
II. Mitochondrial matrix
III. Cytoplasm
IV. Intermembrane space

Choose the correct answer from the options given below:

Question

Match List-I (Process) with List-II (Location):

**List-I**
A. Glycolysis
B. ETS
C. Accumulation of protons
D. Krebs' cycle

**List-II**
I. Inner mitochondrial membrane
II. Mitochondrial matrix
III. Cytoplasm
IV. Intermembrane space

Choose the correct answer from the options given below:

Accepted Answer

C. 1. **Locate glycolysis first.** Glycolysis is the very first step of cellular respiration and it takes place entirely in the **cytoplasm** of the cell, outside the mitochondria.

This gives us:
$$
A \, (	ext{Glycolysis}) ightarrow III \, (	ext{Cytoplasm})
$$

2. **Locate the Electron Transport System (ETS).** The protein complexes of the ETS are embedded within the **inner mitochondrial membrane**, since this is where electrons are passed along the chain.

So:
$$
B \, (	ext{ETS}) ightarrow I \, (	ext{Inner mitochondrial membrane})
$$

3. **Locate proton accumulation.** As electrons move through the ETS, protons ($H^+$) are actively pumped out of the matrix into the **intermembrane space**, building up a concentration there.

Hence:
$$
C \, (	ext{Accumulation of protons}) ightarrow IV \, (	ext{Intermembrane space})
$$

4. **Locate Krebs' cycle.** The enzymes required for the Krebs' cycle (citric acid cycle) are found dissolved in the **mitochondrial matrix**, where the cycle's reactions occur.

Therefore:
$$
D \, (	ext{Krebs' cycle}) ightarrow II \, (	ext{Mitochondrial matrix})
$$

5. **Combine all matches.** Putting it together: A-III, B-I, C-IV, D-II.

Hence, the answer is **Option C: A-III, B-I, C-IV, D-II**.

Match List-I (Process) with List-II (Location): List-I A. Glycolysis B. ETS C. Accumulation of protons D. Krebs' cycle List-II I. Inner mitochondrial membrane II. Mitochondrial matrix III. Cytoplasm IV. Intermembrane space Choose the correct answer from the options given below:

Match List-I (Process) with List-II (Location):

List-I A. Glycolysis B. ETS C. Accumulation of protons D. Krebs' cycle

List-II I. Inner mitochondrial membrane II. Mitochondrial matrix III. Cytoplasm IV. Intermembrane space

Choose the correct answer from the options given below: