viruses and bacteria
DESCRIPTION
Just a quick overview comparison between viruses and bacteria.TRANSCRIPT
![Page 1: Viruses and Bacteria](https://reader035.vdocument.in/reader035/viewer/2022062307/55749373d8b42a7f348b5313/html5/thumbnails/1.jpg)
Viruses and Bacteria
![Page 2: Viruses and Bacteria](https://reader035.vdocument.in/reader035/viewer/2022062307/55749373d8b42a7f348b5313/html5/thumbnails/2.jpg)
Viruses
• A tiny, non-living particle that enters and then reproduces inside a living cell
• Needs a host, which provides a source of energy
• Parasite– Lives on or in a host and can cause
harm
![Page 3: Viruses and Bacteria](https://reader035.vdocument.in/reader035/viewer/2022062307/55749373d8b42a7f348b5313/html5/thumbnails/3.jpg)
Shapes
• Round, rod-shaped, bricks, threads, bullets, robot-like shapes
![Page 4: Viruses and Bacteria](https://reader035.vdocument.in/reader035/viewer/2022062307/55749373d8b42a7f348b5313/html5/thumbnails/4.jpg)
![Page 5: Viruses and Bacteria](https://reader035.vdocument.in/reader035/viewer/2022062307/55749373d8b42a7f348b5313/html5/thumbnails/5.jpg)
Sizes
• Smaller than cells
• Cannot be seen with school microscopes
• Measured in nanometers– 1 billionth of a meter
![Page 6: Viruses and Bacteria](https://reader035.vdocument.in/reader035/viewer/2022062307/55749373d8b42a7f348b5313/html5/thumbnails/6.jpg)
Structure
• Two basic parts– Protein coat which protects itself– Inner core
• Genetic material
![Page 7: Viruses and Bacteria](https://reader035.vdocument.in/reader035/viewer/2022062307/55749373d8b42a7f348b5313/html5/thumbnails/7.jpg)
Surface Proteins
• Can attach to host cells
• Lock and key
• Specific
![Page 8: Viruses and Bacteria](https://reader035.vdocument.in/reader035/viewer/2022062307/55749373d8b42a7f348b5313/html5/thumbnails/8.jpg)
Multiply
• Inside host cell– Virus’s genetic material takes over many
cell functions– Instructs cell to produce the virus proteins
and genetic material– Make new virus’s
![Page 9: Viruses and Bacteria](https://reader035.vdocument.in/reader035/viewer/2022062307/55749373d8b42a7f348b5313/html5/thumbnails/9.jpg)
Bacteria
• Anton van Leeuwenhoek (late 1600s)– Scrapings from teeth– Could only see shapes, but not the parts
inside the cells
![Page 10: Viruses and Bacteria](https://reader035.vdocument.in/reader035/viewer/2022062307/55749373d8b42a7f348b5313/html5/thumbnails/10.jpg)
Bacteria
• Prokaryotes– Genetic material is not contained in a
nucleus (have no nucleus)– Lack some other structures as well
![Page 11: Viruses and Bacteria](https://reader035.vdocument.in/reader035/viewer/2022062307/55749373d8b42a7f348b5313/html5/thumbnails/11.jpg)
Shapes and Sizes
• Spherical, rodlike, spiral
• Vary in size, average is about 0.5-1 micrometer– 1 millionth of a meter
![Page 12: Viruses and Bacteria](https://reader035.vdocument.in/reader035/viewer/2022062307/55749373d8b42a7f348b5313/html5/thumbnails/12.jpg)
![Page 13: Viruses and Bacteria](https://reader035.vdocument.in/reader035/viewer/2022062307/55749373d8b42a7f348b5313/html5/thumbnails/13.jpg)
![Page 14: Viruses and Bacteria](https://reader035.vdocument.in/reader035/viewer/2022062307/55749373d8b42a7f348b5313/html5/thumbnails/14.jpg)