Prokaryotes: Difference between revisions
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These differ from eukaryotes which have a [[Nucleus|nucleus]] containing genetic information ([[DNA|DNA]]). Most prokaryotes are unicellular (single cells) but there are some that have life cycles with multi cellular stages. [[Bacteria|Bacteria]] (such as ''[[Escherichia coli|Escherichia coli]]'')'','' [[Archaea|archaea]] and cynobacteria are prokaryotes<references /><ref>Alberts B., Johnson A., Lewis J., Raff M., Roberts K., Walter P., (2008), Molecular Biology of The Cell, Fifth Edition, New York: Garland Science,Taylor | These differ from eukaryotes which have a [[Nucleus|nucleus]] containing genetic information ([[DNA|DNA]]). Most prokaryotes are unicellular (single cells) but there are some that have life cycles with multi cellular stages. [[Bacteria|Bacteria]] (such as ''[[Escherichia coli|Escherichia coli]]'')'','' [[Archaea|archaea]] and cynobacteria are prokaryotes<references /><ref>Alberts B., Johnson A., Lewis J., Raff M., Roberts K., Walter P., (2008), Molecular Biology of The Cell, Fifth Edition, New York: Garland Science,Taylor and Francis Group, p14.</ref>. The prokaryotes typically has an average diameter size of cell ranging between 0.5-5µm. The DNA in prokaryotes are circular,naked and lies free in the cytoplasm. The prokaryotes have slightly smaller ribosomes, 70S ( about18nm diameter) as compared to eukaryotes, 80S (about 22nm diameter). No endoplasmic reticulum , mitochondria and chloroplasts are present in a prokaryote cell. Prokaryote cells moves with the help of flagella or cilia made of flagellin. Prokaryotes breed through asexual reproduction, usually either by budding or binary fission (simple division) <ref>Jones M., Fosbery R., Taylor D., Gregory J., (2008), Biology, Second Edition, Oxford: Cambridge University Press, p17-18.</ref>. | ||
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Revision as of 23:44, 29 November 2012
These differ from eukaryotes which have a nucleus containing genetic information (DNA). Most prokaryotes are unicellular (single cells) but there are some that have life cycles with multi cellular stages. Bacteria (such as Escherichia coli), archaea and cynobacteria are prokaryotes[1]. The prokaryotes typically has an average diameter size of cell ranging between 0.5-5µm. The DNA in prokaryotes are circular,naked and lies free in the cytoplasm. The prokaryotes have slightly smaller ribosomes, 70S ( about18nm diameter) as compared to eukaryotes, 80S (about 22nm diameter). No endoplasmic reticulum , mitochondria and chloroplasts are present in a prokaryote cell. Prokaryote cells moves with the help of flagella or cilia made of flagellin. Prokaryotes breed through asexual reproduction, usually either by budding or binary fission (simple division) [2].
References
- ↑ Alberts B., Johnson A., Lewis J., Raff M., Roberts K., Walter P., (2008), Molecular Biology of The Cell, Fifth Edition, New York: Garland Science,Taylor and Francis Group, p14.
- ↑ Jones M., Fosbery R., Taylor D., Gregory J., (2008), Biology, Second Edition, Oxford: Cambridge University Press, p17-18.
- ↑ Alberts B., Johnson A., Lewis J., Raff M., Roberts K., Walter P., (2008), Molecular Biology of The Cell, Fifth Edition, New York: Garland Science,Taylor and Francis Group, p14.
- ↑ Jones M., Fosbery R., Taylor D., Gregory J., (2008), Biology, Second Edition, Oxford: Cambridge University Press, p17-18.