Cell Biology Question:

What are the main structures within the cell nucleus?


Within the cell nucleus the main structures are: the nucleolus, an optically dense region, spherical shaped, where there are concentrated ribosomal RNA (rRNA) associated to proteins (there may be more than one nucleolus in a nucleus); the chromatin, made of DNA molecules dispersed in the nuclear matrix during the cell interphase; the karyotecha, or nuclear membrane, the membrane that delimits the nucleus.

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What are the three main parts of a eukaryotic cell?What are the substances that constitute the chromatin? What is the difference between chromatin and chromosome?