Where it's found: enclosed by a membrane in the cytoplasm of a cell [eukaryotic cells ONLY]
What it looks like: a nucleus doesn't have a defined shape, but it is usually spherical in shape; it has a double layered membrane called the nuclear membrane
What it does: the nucleus is in charge of the cell. It contains the DNA of the organism, is where DNA transcription (when mRNA is produced) takes place, makes sure that the daughter cells have the correct amount of DNA and are replicated correctly. The nucleus is considered the 'control center' of a cell for this reason.
Here's where I got this info
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