Question

The reactions which take place in mammalian mitochondria are:
A. \(\beta\)-Oxidation of fatty acid
B. All the reactions of glycolytic cycle
C. All the reaction of urea cycle
D. TCA (tricarboxylic acid) cycle
Choose the correct answer from the options given below:

• A. A, B and D only
• B. A and D only
• C. A and C only
• D. B, C and D only

Hint:

Mitochondrial reactions:
\(\beta\)-oxidation, TCA cycle, oxidative phosphorylation.
Glycolysis: cytosol.
Urea cycle: mitochondria + cytosol.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Mitochondria are the site of specific metabolic reactions.
Different pathways occur in different cellular compartments.

Step 2: Key Formula or Approach:
No specific formula.
Need to know the location of metabolic pathways.

Step 3: Detailed Explanation:
A. \(\beta\)-Oxidation of fatty acids occurs in mitochondria - correct.
B. Glycolysis occurs in the cytosol - incorrect.
C. Urea cycle occurs partly in mitochondria and partly in cytosol.
The complete urea cycle is not entirely in mitochondria - incorrect.
D. TCA cycle occurs in the mitochondrial matrix - correct.
Thus, A and D are correct.

Step 4: Final Answer:
The reactions that take place in mitochondria are A and D.
Hence, the correct option is (B).