Regulation and Expression of Genes

The Cell Nucleus and Ribosomal
RNA
The cell nucleus is the main center from which
cell functions are regulated. A highly important
function of cells is to produce endogenous proteins
(protein synthesis). The proteins, in turn,
are required for innumerable vital processes,
such as the catalyzation of complex biochemical
reactions, production of energy, transport of
molecules, etc. Cells from different tissues
differ with respect to the genes that are expressed.