The nucleus is a membrane-bound organelle found in eukaryotic cells. It serves as the control center of the cell, housing the cell's genetic material and coordinating cellular activities.
The nucleus is surrounded by a double membrane called the nuclear envelope, which contains nuclear pores that regulate the passage of molecules in and out of the nucleus. Inside the nucleus, there is a semi-fluid matrix called nucleoplasm, where the genetic material is located. The genetic material consists of DNA, which is organized into structures called chromosomes. The nucleus also contains a structure called the nucleolus, which is involved in the production of ribosomes.
When studying the nucleus, it's important to focus on the following key points: