Animal cells after removal of nuclei still contained DNA. The source of this DNA is

Options

A. nucleosomes
B. mitochondria
C. peroxisomes
D. lysosome

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the presence of DNA in animal cells after the nuclei have been removed. It is important to identify where this DNA could come from.

2. **Identifying Cell Organelles**: In an animal cell, there are various organelles, including the nucleus, mitochondria, Golgi bodies, endoplasmic reticulum, lysosomes, and peroxisomes.

3. **Focus on Mitochondria**: Among these organelles, mitochondria are unique because they possess their own DNA, known as mitochondrial DNA (mtDNA). This DNA is circular and distinct from the nuclear DNA found in the nucleus.

4. **Removal of Nuclei**: When the nuclei are removed from animal cells, the nuclear DNA is lost. However, the mitochondria remain intact and continue to exist within the cell.

5. **Source of Remaining DNA**: Since mitochondria have their own DNA, even after the removal of the nuclei, the DNA present in the cell is derived from the mitochondria.

6. **Conclusion**: Therefore, the source of DNA in animal cells after the removal of nuclei is the mitochondria.

**Final Answer**: The source of this DNA is mitochondria.

---