The following sections of this BookRags Literature Study Guide is offprint from Gale's For Students Series: Presenting Analysis, Context, and Criticism on Commonly Studied Works: Introduction, Author Biography, Plot Summary, Characters, Themes, Style, Historical Context, Critical Overview, Criticism and Critical Essays, Media Adaptations, Topics for Further Study, Compare & Contrast, What Do I Read Next?, For Further Study, and Sources.
(c)1998-2002; (c)2002 by Gale. Gale is an imprint of The Gale Group, Inc., a division of Thomson Learning, Inc. Gale and Design and Thomson Learning are trademarks used herein under license.
The following sections, if they exist, are offprint from Beacham's Encyclopedia of Popular Fiction: "Social Concerns", "Thematic Overview", "Techniques", "Literary Precedents", "Key Questions", "Related Titles", "Adaptations", "Related Web Sites". (c)1994-2005, by Walton Beacham.
The following sections, if they exist, are offprint from Beacham's Guide to Literature for Young Adults: "About the Author", "Overview", "Setting", "Literary Qualities", "Social Sensitivity", "Topics for Discussion", "Ideas for Reports and Papers". (c)1994-2005, by Walton Beacham.
All other sections in this Literature Study Guide are owned and copyrighted by BookRags, Inc.
Prokaryotes are cells or organisms that lack a nuclear membrane and membrane bound organelles. Prokaryotic cells are characteristic of a metabolically diverse assortment of bacterial organisms grouped together in the kingdom Monera. Two major groups of bacteria, the Eubacteria and Archaebacteria, have been identified and because they differ in important ways, they are sometimes divided into separate phylogenetic kingdoms. Prokaryotic cells differ from eukaryotic cells in important ways. Prokaryotic cells are usually much smaller than eukaryotic cells, and are able to grow and divide rapidly. Eukaryotes, with a true membrane-bound nucleus and discrete membrane-bound organelles, are able to compartmentalize functional activity into structural components such as mitochondria, chloroplasts, lysosomes, endoplasmic reticulum, and Golgi complex. Prokaryote cells may carry out all of the activities assigned to organelles without the benefit of these specialized structures. Prokaryotes and eukaryotes differ to some extent in their biochemical composition, particularly with respect to their lipid composition. They also differ in many aspects of their metabolism. Some of the most significant of these differences involve the nature of genes and the manner in which genetic information is expressed. The genes of prokaryotes are simpler and do not contain the large amounts of material incidental to protein synthesis found in eukaryotes. Prokaryotes have been present on Earth for much of its history, and in one form or another have occupied nearly all potential habitats. Although some prokaryotes cause disease in plants and animals, the overwhelming majority do not. Many are necessary for timely recycling of dead organic matter that without them would tend to accumulate in the environment.