Question

\(\underline{\hspace{1cm}}\) is the major site for ATP synthesis amid oxidative metabolism and so called power house of cells.

• A. Chloroplast
• B. Nucleus
• C. Ribosome
• D. Mitochondrion

Hint:

Mitochondria produce ATP through oxidative phosphorylation. In plants, chloroplasts make glucose (photosynthesis), but mitochondria are still the powerhouse for ATP in all eukaryotes.

Answer 1

The Correct Option is D

Step 1: Understanding ATP synthesis.
ATP (adenosine triphosphate) is the energy currency of the cell. It is primarily synthesized during cellular respiration, which occurs in the mitochondria through oxidative phosphorylation.

Step 2: Evaluating the options.
- **Chloroplast**: Involved in photosynthesis in plants, not the main site for oxidative ATP synthesis.
- **Nucleus**: Stores genetic material and regulates cellular activities, but not ATP synthesis.
- **Ribosome**: Responsible for protein synthesis, not energy production.
- **Mitochondrion**: The site of the electron transport chain and oxidative phosphorylation, generating ATP. Known as the powerhouse of the cell.

Step 3: Conclusion.
The correct answer is Mitochondrion.

Final Answer: \[ \boxed{\text{Mitochondrion is the powerhouse of the cell.}} \]