Question

the most prominent organelle in most eukaryotic cells, that contains most of its dna, is the endoplasmic reticulum. nucleus. ribosome. nucleolus. cell membrane.

Explanation:

The endoplasmic reticulum is involved in protein and lipid synthesis, not DNA storage. Ribosomes are responsible for protein assembly and have no DNA storage role. The nucleolus is a structure inside the nucleus that makes ribosomes, not the main DNA-containing organelle. The cell membrane regulates what enters/exits the cell and does not hold most cellular DNA. The nucleus is the large, prominent organelle in eukaryotic cells that houses the vast majority of the cell's genetic material (DNA).

Answer:

nucleus.