Which one is common amongst nucleus , chloroplast and mitochondria ?

Options

A. Cristae
B. Thylakoids
C. Nucleic acid
D. Carbohydrate metabolism.

Answer

To answer the question "Which one is common amongst nucleus, chloroplast, and mitochondria?", we will analyze the options provided and determine which feature is shared by all three organelles.

### Step-by-Step Solution:

1. **Identify the Organelles**:
- The organelles in question are the nucleus, chloroplast, and mitochondria. All three are essential components of eukaryotic cells.

2. **Review the Options**:
- The options given are:
a. Cristae
b. Thylakoids
c. Nucleic acid
d. Carbohydrate metabolism

3. **Evaluate Option a: Cristae**:
- Cristae are the folds of the inner membrane of mitochondria. They are specific to mitochondria and are not found in the nucleus or chloroplasts.
- **Conclusion**: Not common.

4. **Evaluate Option b: Thylakoids**:
- Thylakoids are flattened sac-like structures found in chloroplasts, where photosynthesis occurs. They are not present in the nucleus or mitochondria.
- **Conclusion**: Not common.

5. **Evaluate Option c: Nucleic acid**:
- Nucleic acids (DNA and RNA) are present in all three organelles. The nucleus contains DNA, while both chloroplasts and mitochondria contain their own DNA (chloroplast DNA and mitochondrial DNA).
- **Conclusion**: Common feature.

6. **Evaluate Option d: Carbohydrate metabolism**:
- Carbohydrate metabolism primarily occurs in mitochondria through processes like the Krebs cycle and electron transport chain. The nucleus and chloroplasts do not play a direct role in carbohydrate metabolism.
- **Conclusion**: Not common.

7. **Final Answer**:
- The common feature among the nucleus, chloroplast, and mitochondria is **nucleic acid**.