The total DNA comprises what amount of cytoplasmic DNA in cells?
Correct Answer :
1-5%
Solution :
The correct option is 1-5%.
In eukaryotic cells, the vast majority of cellular DNA is located within the nucleus, housing the genome that controls most cellular functions. This nuclear DNA accounts for about 95% to 99% of the cell's total DNA.
However, a small fraction of DNA is located outside the nucleus, in the cytoplasm. This is referred to as cytoplasmic or extranuclear DNA. The main sources of cytoplasmic DNA are:
1. Mitochondria (mitochondrial DNA or mtDNA), which are present in almost all eukaryotic cells.
2. Chloroplasts (chloroplast DNA or cpDNA), which are present in plant and algal cells.
Because organelles like mitochondria and chloroplasts contain their own circular genomes to code for a subset of their proteins, they contribute to the total DNA content of the cell. In a typical eukaryotic cell, this cytoplasmic DNA comprises approximately 1% to 5% of the total cellular DNA.
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