In eukaryotic cells, where is DNA primarily found?

• A. Only in ribosomes, where it is translated into protein
• B. In the nucleus (as chromosomes) and in mitochondria (and in chloroplasts in plants)
• C. Only in the Golgi apparatus, where it is packaged for secretion
• D. Only in the cytosol, freely floating and not associated with organelles

Answer: (B)

Verified step by step guidance

1. Understand that DNA in eukaryotic cells is not found randomly but is localized in specific organelles.
2. Recall that the nucleus is the primary location of DNA in eukaryotic cells, where it is organized into chromosomes.
3. Recognize that mitochondria also contain their own DNA, which is separate from nuclear DNA and important for mitochondrial function.
4. In plant cells, chloroplasts also contain their own DNA, similar to mitochondria, supporting their role in photosynthesis.
5. Eliminate options that incorrectly place DNA only in ribosomes, Golgi apparatus, or freely in the cytosol, as these are not sites of DNA localization.