Nucleus
The nucleus is generally between 5 to 10
micrometers in diameter. The nucleus has long been called the control c
enter
of the cell because it houses DNA. The nucleus contains most of the
genetic information in the form of DNA. DNA is the organic "code" that
allows us to be who we are, have the characteristics we do. This DNA code
called chromatin, condenses into chromosomes during mitosis. The nucleus
has a membrane that is porous. The "pores" in the membrane allow for RNA,
another type of nucleic acid, to leave the nucleus after being made from the DNA
template. Both transfer RNA and ribosomal RNA is made in the nucleolus.
The nucleolus resides within the nucleus. Look closely at this drawing.
It depicts the endoplasmic reticulum being closely associated to the nucleus.