Biochemistry 2288A Chapter Notes - Chapter 2.3 to 2.5: Cell Membrane, Prokaryote, Plant Cell
14 Aug 2017
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Document Summary
Of all cells revealed by the microscope, bacteria have the simplest structure and come closest to showing us life stripped down to its essentials. The property of the presence or absence of a nucleus is used as the basic but fundamental classification of all living things: eukaryotes (do have nucleus) and prokaryotes (do not have nucleus). Bacteria typically are shaped like: spherical, rodlike, corkscrew-shaped. Under optimum conditions, many prokaryotic cells can duplicate themselves in as little as 20 minutes. In evolution theory, the speed that prokaryotes can evolved is fast, mainly due to: their large population, rapid growth rates, ability to exchange bits of genetic material by a process akin to sex. This allow prokaryotes rapidly acquiring the ability to use a new food source or to resist being killed by a new antibiotic. Prokaryotes are the most diverse and numerous cells on earth. Most prokaryotes like as single-celled organisms, some join to form: chains, clusters, other organized multicellular structures.
