Which is absent in Mitochondrial DNA ?

Options

A. Basic Histone Proteins
B. Purines
C. Phosphates
D. All correct

Answer

**Step-by-Step Solution:**

1. **Understanding Mitochondrial DNA**: Mitochondrial DNA (mtDNA) is a type of DNA found in mitochondria, the energy-producing organelles in eukaryotic cells. It is distinct from nuclear DNA.

2. **Characteristics of Mitochondrial DNA**: Mitochondrial DNA is circular and double-stranded. It is referred to as "naked" DNA, which means it does not have histone proteins associated with it.

3. **Histone Proteins**: Histones are basic proteins that help package and organize DNA into a compact structure in the nucleus. They play a crucial role in the formation of chromatin.

4. **Absence in Mitochondrial DNA**: Unlike nuclear DNA, mitochondrial DNA does not contain histone proteins. This is a key distinguishing feature of mtDNA.

5. **Conclusion**: Therefore, the component that is absent in mitochondrial DNA is histone proteins.

**Final Answer**: Histone proteins are absent in mitochondrial DNA.

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