DNA is not present in

Options

A. Nucleus
B. Mitochondria
C. Chloroplast
D. Ribosomes

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks where DNA is not present among the given options: Nucleus, Mitochondria, Chloroplasts, and Ribosomes.

2. **Analyzing Each Option**:
- **Nucleus**: The nucleus is known as the control center of the cell and houses the cell's DNA. Therefore, DNA is present in the nucleus.
- **Mitochondria**: Mitochondria are known as the powerhouse of the cell and contain their own DNA (mtDNA), which is circular and semi-autonomous. Thus, DNA is present in mitochondria.
- **Chloroplasts**: Chloroplasts are found in plant cells and are responsible for photosynthesis. They also contain their own DNA, similar to mitochondria, making them semi-autonomous as well. Therefore, DNA is present in chloroplasts.
- **Ribosomes**: Ribosomes are the sites of protein synthesis in the cell. They do not contain DNA; instead, they are made up of ribosomal RNA (rRNA) and proteins. Thus, DNA is absent in ribosomes.

3. **Conclusion**: After analyzing all the options, the only organelle that does not contain DNA is ribosomes. Therefore, the correct answer is ribosomes.

**Final Answer**: DNA is not present in ribosomes.

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