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Virus Structure And Method Of Invasion PowerPoint Presentation

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Virus Structure And Method Of Invasion Presentation Transcript

Slide 1 - Virus Structure and Method of Invasion Higher Biology
Slide 2 - Introduction to viruses Obligate parasites Specific to type of cells they target -poliomylelitis virus attacks nerve cells -hepatitis virus attacks liver cells Reproduction is their only true characteristic of being alive Much smaller than bacteria (20-300nm)
Slide 3 - Viral Structure Not a cell! DNA or RNA (retrovirus) Surrounded by protective protein coat (capsid) Genetic material carries information for multiplication Hijacks biochemical machinery of host cell to carry these processes out
Slide 4 - Bacteriophage
Slide 5 - Invasion of a cell by a virus Virus can lie dormant for many years until it comes into contact with a suitable host cell Binds with molecules on surface of host cell Herpes -whole virus enters cell Bacteriophage -viral DNA injected via hollow tail
Slide 6 - Alteration of Cell Instruction Virus takes control of cell machinery Depends on host for -ATP -supply of free nucleotides Virus suppresses cell’s normal nucleic acid replication and protein synthesis Manufactures many identical copies of viral nucleic acid and protein coats
Slide 7 - New viral particles become assembled and become released by: Lysis -viral nucleic acid used to synthesise lysis enzymes -bursting of host cell to release viral particles OR 2. Buds contaning virus are formed
Slide 8 - ppt slide no 8 content not found
Slide 9 - Retrovirus Contains RNA No DNA to transcribe into mRNA Reverse transcriptase injected into cell by virus with RNA -enzyme reverses normal transcription -Produces viral DNA from RNA -Virus uses DNA to replicate
Slide 10 - Some video clips Bacteriophage entering a cell HIV replication
Slide 11 - This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.
 

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