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Amoeba cell showing the location of the nucleus.

(genetic biology)

Grammar: noun
plural: nuclei
Definition: a membrane-bound structure found within eukaryotic cells, which contains the cell's hereditary material and controls its metabolism, growth, and reproduction
Example:
1. Chromosomes are usually diffuse in the nucleus because the DNA is being utilised for cellular maintenance.

2. Paramecia have two types of nuclei, i.e. macronuclei and micronuclei.
Related Compound: macronucleus, micronucleus