Viruses

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Viruses & Bacteria

Chapter 17

Biology 11

Presentation put together by Mandie Lynn Walls

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What are Viruses

A virus is a non-cellular particle made up of genetic material and protein that can invade living cells.

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T4 Bacteriophage

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Herpes Virus

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Escherichia Coli Bacterium

E. coli is a bacterium. That is a crude cell, it is not a virus because viruses are protein containers with DNA cores or RNA cores.

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E. Coli and the Bacteriophage

What it looks like in real life

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The Structure Of a Virus

Viruses are composed of a core of nucleic acid

The Nucleic acid core is surrounded by a protein coat called a capsid

The Nucleic core is either made up of DNA or RNA but never both

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Cycle of Lytic and Lysogenic

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Vaccines

Viruses grown on chicken embryos are attenuated vaccines

Another type of vaccine is made by heat killing the virus

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Retrovirus

Change DNA into RNA.

Example of a Retrovirus is HIV

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A typical, "minimal" retrovirus consists of:

an outer envelope which was derived from the plasma membrane of its host

many copies of an envelope protein embedded in the lipid bilayer of its envelope

a capsid; a protein shell containing

two molecules of RNA and

molecules of the enzyme reverse transcriptase

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Bacteria Cell

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Prokaryotes

Cells that do not have a nucleus

Exist almost every where on earth

Grow in numbers so great you can see them with the unaided eye

Are placed in either the Eubacteria or the Archebacteria Kingdoms

Make up the smaller of the two kingdoms

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