DNA is not present in

Options

A. 1)Ribosomes
B. 2)Nucleus
C. 3)Mitochondria
D. 4)Chloroplast

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks where DNA is not present among the given options: ribosome, nucleus, mitochondria, and chloroplast.

2. **Analyzing Each Option**:
- **Option A: Ribosome**: Ribosomes are known as the protein factories of the cell. They are composed of ribosomal RNA (rRNA) and proteins. Importantly, ribosomes do not contain DNA. Therefore, DNA is absent in ribosomes.
- **Option B: Nucleus**: The nucleus is the control center of the cell and houses the cell's genetic material. It contains chromosomal DNA, making it a site where DNA is present. Thus, this option is incorrect.
- **Option C: Mitochondria**: Mitochondria are semi-autonomous organelles that contain their own DNA, which is typically circular and single-stranded. Therefore, DNA is present in mitochondria, making this option incorrect.
- **Option D: Chloroplast**: Similar to mitochondria, chloroplasts are also semi-autonomous organelles that contain their own DNA. Chloroplasts have single-stranded DNA, indicating that DNA is present here as well, making this option incorrect.

3. **Conclusion**: Based on the analysis, the only option where DNA is not present is **Option A: Ribosome**.

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

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