The organelle that contains DNA and uses it to control the rest of the cell is the nucleus.

Here's why:

* DNA storage: The nucleus is the central control center of the cell and houses the cell's DNA in the form of chromosomes.

* Transcription and RNA synthesis: DNA within the nucleus serves as a template for the synthesis of RNA (messenger RNA, mRNA).

* Genetic information transfer: mRNA molecules then leave the nucleus and travel to ribosomes, where they direct the synthesis of proteins.

* Cell regulation: Proteins are the workhorses of the cell, carrying out a vast array of functions, including metabolism, structure, and signaling. By controlling protein synthesis, the nucleus ultimately controls all cellular activities.

So, the nucleus acts as the "brain" of the cell, directing its activities based on the information encoded in its DNA.