The Cell Nucleus
The nucleus is the cell's control room. A double membrane with pores wraps the chromatin, and inside sits the nucleolus where ribosome parts are built. It connects directly to the rough endoplasmic reticulum.
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Labelled parts
Key points
- The nuclear envelope has two membranes and many pores that let RNA and proteins pass.
- Chromatin is DNA wrapped around proteins; it coils up into chromosomes before division.
- The nucleolus is where ribosomal RNA is made and combined with proteins into ribosome subunits.
Check yourself
What is the job of the nucleolus?
Check yourself
What lets messenger RNA leave the nucleus?
Explanations rewritten in our own words from Biology 2e, Chapter 4: Cell Structure (OpenStax), licensed CC BY-NC-SA 4.0. openstax.org/books/biology-2e/pages/4-introduction