1. Cell Structure


In eukaryotic cells, the DNA is typically housed in a nucleus (plural = nuclei), the most prominent organelle in a cell . This organelle directs the synthesis of ribosomes and proteins. Let’s look at it in more detail

Nucleus of the cell with associated structures, labeled

The nucleus stores chromatin (DNA plus proteins) in a gel-like substance called the nucleoplasm. The nucleolus is a condensed chromatin region where ribosome synthesis occurs. We call the nucleus’ boundary the nuclear envelope. It consists of two phospholipid bilayers: an outer and an inner membrane. The nuclear membrane is continuous with the endoplasmic reticulum. Nuclear pores allow substances to enter and exit the nucleus.

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