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Description : Ppt Presentation on Viruses which is created by Jeddy and available for free download Viruses powerp... Read More

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Published on : Aug 18, 2018
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Slide 1 - Viruses & Bacteria Chapter 17 Biology 11 Presentation put together by Mandie Lynn Walls
Slide 2 - What are Viruses A virus is a non-cellular particle made up of genetic material and protein that can invade living cells.
Slide 3 - T4 Bacteriophage
Slide 4 - Herpes Virus
Slide 5 - 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.
Slide 6 - E. Coli and the Bacteriophage What it looks like in real life
Slide 7 - 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
Slide 8 - Cycle of Lytic and Lysogenic
Slide 9 - Vaccines Viruses grown on chicken embryos are attenuated vaccines Another type of vaccine is made by heat killing the virus
Slide 10 - Retrovirus Change DNA into RNA. Example of a Retrovirus is HIV
Slide 11 - 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
Slide 12 - Bacteria Cell
Slide 13 - 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
Slide 14 - ppt slide no 14 content not found
Slide 15 - Eubacteria Make up the larger of the two prokaryote kingdoms Generally are surrounded by a cell wall composed of complex carbohydrates
Slide 16 - Cyanobacteria Photosynthetic bacterium Bluish-greenish color Contain membranes that carry out the process of photosynthesis Do not contain the same type of chloroplasts as plants do This bluish-greenish algae can be found nearly everywhere on earth. Can survive in extremely hot environments and even extremely cold environment
Slide 17 - Archaebacteria Lack important carbohydrate found in cell walls Have different lipids in their cell membrane Different types of ribosomes Very different gene sequences Archaebacteria can live in extremely harsh environments They do not require oxygen and can live in extremely salty environments as well as extremely hot environments.
Slide 18 - Identifying Prokaryotes Cell Shape Cell Wall Movement
Slide 19 - Bacterium Shapes Cocci~ Sphere shaped bacteria Bacillus~ Rod shaped bacteria Spirrillium ~ Spiral shaped bacteria Flagella~ Leg-like structures that help to propel the bacterium.
Slide 20 - Gram + and Gram – Bacterium Cell Walls
Slide 21 - Cellular Walls Chemical nature of a cell wall can be determined by Gram Staining By finding out what color the cell produces when it is gram stained you can figure out the type of carbohydrates in the cell wall
Slide 22 - Movement Flagella ~ Tail like structure the whips around to propel the bacterium Cillia ~ Miniature flagella surround the cell that help to “swim” Non motile ~ Sticky cillia like structures that keep the bacterium from moving
Slide 23 - Flagella
Slide 24 - ppt slide no 24 content not found
Slide 25 - Bacteria and their energy Autotrophs Chemotrophs Heterotrophs
Slide 26 - Autotrophs Make their own energy Using Solar energy Eg. Cyanobacteria
Slide 27 - Chemotrophs Make own Energy Using Chemical energy Eg. Archaebacteria
Slide 28 - Heterotrophs Obtain food By eating Eg. E-coli
Slide 29 - Bacteria Respiration Obligate Anaerobes Facultative Anaerobes Obligate Aerobes Live without Oxygen Can live with or without oxygen Cannot live without oxygen.
Slide 30 - Bacteria Reproduction Binary Fission Conjugation Spore Formation
Slide 31 - Cellular organism copies it’s genetic information then splits into two identical daughter cells
Slide 32 - Conjugation A type of Bacteria Sex Two organism swap genetic information, that contains the information such as a resistance to penicillin
Slide 33 - Spore Formation: Endospore A type of dormant cell Exhibit no signs of life Highly resistant to environmental stresses such as: -High temperatures -Irradiation -Strong acids -Disinfectants Endospores are formed by vegetative cells in response to environmental signals that indicate a limiting factor for vegetative growth, such as exhaustion of an essential nutrient.
Slide 34 - Symbiosis Close relationship between to species in which at least one species benefits from the other Live together for LIFE
Slide 35 - Parasitism Bacteria exploit the host cell, injuring them Eg. Mychobacterium tuberculosis
Slide 36 - Mutualism Symbiosis in which two of the species live together in such a way that both benefit from the relationship Eg. E-coli
Slide 37 - Nitrogen Fixations Process by which nitrogen in the atmosphere is converted into a form that can be used by living things
Slide 38 - THE END
Slide 39 - This powerpoint was kindly donated to 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.