Question

Citric acid cycle takes place in:

• A. Cytosol
• B. Peroxisomes
• C. Mitochondria
• D. None of these

Hint:

Remember:
Glycolysis → Cytosol
Krebs cycle → Mitochondrial matrix
ETS → Inner mitochondrial membrane Location-based questions are very common in biology exams.

Answer 1

The Correct Option is C

Step 1: Recall the stages of cellular respiration. Cellular respiration occurs in three main stages:
Glycolysis — in cytosol
Citric acid cycle (Krebs cycle) — in mitochondria
Electron transport chain — inner mitochondrial membrane
Step 2: Identify the location of the citric acid cycle. The citric acid cycle occurs in the mitochondrial matrix of eukaryotic cells.
Step 3: Eliminate incorrect options.
Cytosol: Site of glycolysis, not the citric acid cycle.
Peroxisomes: Involved in fatty acid oxidation and detoxification.
None of these: Incorrect since mitochondria is listed.
Hence, the correct answer is \[ \boxed{\text{Mitochondria}} \]