Question

define nucleus...............????

Answer 1

PHYSICS

the positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.

BIOLOGY

a dense organelle present in most eukaryotic cells, typically a single rounded structure bounded by a double membrane, containing the genetic material.

Answer 2

 The nucleus is a membrane bound structure that contains the cell's hereditary information and controls the cell's growth  and reproduction. It is commonly the most prominent organelle  in the cell. The nucleus is surrounded by a structure called the nuclear envelope.