The molecular biology of all eukaryotic cells, that is all cells that have
nuclei in them, is almost the same. And, therefore, we’re not going to
focus much in this course this semester on specific species but rather
focus on general principles that would allow us to understand the cells
and the tissues and the physiological processes that are applicable to
all species on the surface of the planet. Let’s just look here and get us
some perspective on this because, the fact of the matter is, is that
multicellular life forms, like ourselves, we have, the average human
being has roughly three or four or five times ten to the thirteenth cells
in the body.