Viruses & Prokaryotes.

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Presentation transcript:

Viruses & Prokaryotes

What is a virus? Infectious agents Not an organism Why not? 1/100 the size of a bacterium http://learn.genetics.utah.edu/content/begin/cells/scale/ Pathogens – disease causing agents (mutagen – mutation causing agents) including viruses, bacteria, fungi, etc (“germ” not scientific) infectious agents – not alive, not an organism b/c they require a host cell to replicate (cannot reproduce on their own) referred to as obligate intracellular parasites – depends on the cellular metabolism of a host cell

Main differences: DNA or RNA viruses Other differences: structure, shape, etc Viruses can infect animals, plants, insects, bacteria, etc They are usually species-specific, viral capsid proteins are bind to specific membrane proteins on host cells

Helical Icosahedral Complex Viral Shapes Basic Shape Example Tobacco mosaic virus Icosahedral Herpes simplex Complex T-4 Bacteriophage http://www.peteducation.com/article.cfm?c=16+2160&aid=2956

Viral Structure Show HHMI animations

http://www2.bc.cc.ca.us/bio16/images/lysogenic.jpg

http://bio3400.nicerweb.net/bio1151/Locked/media/ch18/18_07LamdaLyticLysoCycle.jpg

http://wikileon-period2. wikispaces http://wikileon-period2.wikispaces.com/file/view/Lytic_and_Lysogenic_Cycle.jpg/134229667/Lytic_and_Lysogenic_Cycle.jpg

Staphylococcus aureus Bacterial Shapes Name Basic Shape Example Coccus (sphere) Staphylococcus aureus Bacillus (rod) (starting to divide) Salmonella typhi Spirillum (spiral) Campylobacter jejuni

Viruses vs. Bacteria

Sources http://ppdictionary.com/viruses.htm http://www.peteducation.com/article.cfm?c=16+2160&aid=2956 http://home.comcast.net/~pegglestoncbsd/microbiology_files/image003.jpg http://www.sciencelearn.org.nz/Science-Stories/Microorganisms/Sci-Media/Images/Bacteriophage