Final answer:
The nucleus is the main organelle responsible for housing DNA and controlling gene expression in eukaryotic cells.
Explanation:
Nucleus
- Contains the DNA: The nucleus houses the cell's DNA in the form of chromatin.
- Contains a thick gel-like substance: The nucleus contains a thick liquid called nucleoplasm.
- The most obvious structure in the cell: Typically, the nucleus is the most prominent organelle in a eukaryotic cell.
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