define nucleus??????
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A nucleus is a membrane-bound organelle that contains the cell's chromosomes. Pores in the nuclear membrane allow for the passage of molecules in and out of the nucleus.
Answer:
The nucleus is the information centre of the cell and is surrounded by a nuclear membrane in all eukaryotic... A cell normally contains only one nucleus. Under some conditions, however, the nucleus divides but the cytoplasm does not.
Explanation:
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