Thursday, January 29, 2009

Prokaryotic Cell

A prokaryotic cell is a cell which lacks a membrane-bound nucleus or any other membrane-bound organelles. A prokaryotic cell has few internal structures that are distinguishable under a microscope. Cells in the monera kingdom such as bacteria and cyanobacteria are prokaryotes.

Prokaryotic cells differ significantly from eukaryotic cells. They don't have a membrane-bound nucleus and instead of having chromosomal DNA, their genetic information is in a circular loop called a plasmid. Prokaryotic cells feature three major shapes: rod shaped, spherical, and spiral. Instead of going through elaborate replication processes, they divide by binary fission.