The genome of an organism is the summation of all the genes in the cells that hold information on how the organism is built and maintained. In higher organisms, the genome also contains non-coding regions that also play a significant role in the cells such as ensuring the integrity of chromosome ends. The genome of a human being is composed of approximately 3 billion base pairs.
The genome of organisms may not necessarily be found in the nucleus of cells, especially in eukaryotes, but in addition can be found even in membrane-bound organelles like the mitochondria and chloroplast.
