Cliffs plant biology quick review by Patricia J Rand PDF

By Patricia J Rand

ISBN-10: 0764523864

ISBN-13: 9780764523861

ISBN-10: 0764585606

ISBN-13: 9780764585609

A entire evaluate advisor that can assist you refresh your examine. This advisor is very valuable for midterms and ultimate tests, condensing a semester's worthy of knowledge into one concise quantity.

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F 12/21/00 4:03 PM Page 20 CELLS Table 3-1: Comparison of Prokaryote and Eukaryotes Features Prokaryotes Eukaryotes Average size of cells 1–10 Φm 10–100 Φm Nucleus absent (have a “nucleoid” region) present as a distinct structure Nuclear envelope (membrane) absent present, surrounds the nucleus Genetic material (DNA) present in one large circular molecule, which acts as a “chromosome” in the nucleoid region present in linear chromosomes in the nucleus, usually many per cell DNA bound to histones (proteins) no yes Cytoskeleton of microtubules and actin filaments absent present Membranebounded organelles absent present Ribosomes present present Plasma membrane present present Cell wall present present in plants and, some other organisms Origin of the eukaryote type.

These structural and physiological differences lead some biologists to postulate the serial endosymbiotic theory of organelles in eukaryote cells. ) The theory suggests that, early in the development of life on Earth, what are now organelles of larger, eukaryotic cells were simple, free-living prokaryotes. At some point in time, each independently developed a symbiotic relationship with larger, heterotrophic cells bringing to the partnership energy-capturing and -converting abilities and receiving in trade a physical home that provided the chemical necessities for life and protection from severe environmental stresses.

F 12/21/00 4:03 PM Page 21 CELLS bacteria: Both bacteria and the organellescan divide, their DNA is organized similarly, and both have small ribosomes. Additionally, antibiotics inhibit protein synthesis in ribosomes of mitochondria, chloroplasts, and bacteria, but have no effect on synthesis in cytosomal ribosomes of eukaryotic cells. These structural and physiological differences lead some biologists to postulate the serial endosymbiotic theory of organelles in eukaryote cells. ) The theory suggests that, early in the development of life on Earth, what are now organelles of larger, eukaryotic cells were simple, free-living prokaryotes.

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Cliffs plant biology quick review by Patricia J Rand


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