DNA is tightly packed in the nucleus. DNA molecule wraps around histone proteins to form tight loops called nucleosomes. Nucleosome is a structure formed by two molecules of each H2A,H2B,H3&H4. They associate to form an elliptical bead like structure. One nucleosome is covered by a H1 protein and 1 3/4 of DNA wraps around one nucleosome. These nucleosomes coil and stack together to form fibre called chromatin which constitutes the genetic material inside the nucleus.
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The cell was first discovered by Robert Hooke in 1665 using a microscope.
The first cell theory is credited to the work of Theodor Schwann and Matthias Jakob Schleiden in the 1830s.
Hooke had discovered plant cells -- more precisely, what Hooke saw were the cell walls in cork tissue. In fact, it was Hooke who coined the term "cells": the boxlike cells of cork reminded him of the cells of a monastery.
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