Chapter 19: The Diversity of Prokaryotes and Viruses
Relative Sizes of Microorganisms Eukaryotic cells (10–100 μ m) Prokaryotic cells (0.2–10 μ m) cyanobacterium Viruses (0.05–0.2 μ m) Escherichia coli Staphylococcus 1 μ m Rank each of these in terms of size relative to eachother
What are these?
Viruses Come in a Variety of Shapes Examples of common viruses?
Treating Diseases With Viruses • Bacteriophages can treat bacterial diseases – Rise in bacterial antibiotic resistance makes standard drugs less effective – Bacteriophages specifically target host bacteria – Bacteriophages are harmless to human body cells Bacteriophages Bacterial cell What are these specifically? What is a “ghost”? Where is the DNA in this picture?
Bacterial or viral infections?
HIV virus Unique type of virus: Lyse: cell pops open
How is kuru transmitted?
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