Question

Citric acid cycle takes place in _______

• A. Cytoplasm
• B. Nucleus
• C. Mitochondria
• D. Ribosome

Hint:

Glycolysis occurs in cytoplasm, while the citric acid cycle occurs in mitochondria.

Answer 1

The Correct Option is C

Concept:
The citric acid cycle is also known as the Krebs cycle or tricarboxylic acid cycle. It is a central metabolic pathway for energy production.

Step 1: Understanding the citric acid cycle.
The citric acid cycle oxidizes acetyl-CoA into carbon dioxide and produces reduced coenzymes such as NADH and FADH\(_2\).

Step 2: Site of the cycle.
In eukaryotic cells, the citric acid cycle takes place in the mitochondrial matrix.

Step 3: Why mitochondria?
Mitochondria are known as the powerhouse of the cell because they are involved in aerobic respiration and ATP production.

Step 4: Checking other options.
Cytoplasm is the site of glycolysis.
Nucleus contains genetic material and controls cellular activities.
Ribosomes are involved in protein synthesis.
The citric acid cycle occurs in mitochondria.

Step 5: Final answer.
Therefore, the citric acid cycle takes place in mitochondria. \[ \boxed{\text{Mitochondria}} \]