Download Chapter 18.notebook

Chapter 18.notebook
May 08, 2015
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Chapter 18
Viruses and Bacteria
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Label the diagram of the atom.
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{
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protons
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electrons
nucleus
neutrons
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18.1 Viruses
Objectives
• Identify the structures and characteristics of viruses and bacteria
• Nucleic acids enclosed in a protein coat called a capsid
• Smaller than the smallest bacterium
Influenza Virus
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Chapter 18.notebook
May 08, 2015
Viruses
Viruses
• Nonliving ­ must infect a host cell in order to function
• Viruses are named for the disease that they cause or are given a code number • Bacteriophage ­
A virus that infects a bacterium T4 Virus which infects E. coli
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Viruses
Diseases Caused by Viruses
• Viruses have many shapes.
• Chicken pox
• HIV/AIDS
• Influenza
• Mumps, measles, rubella
• Warts
• Shingles
• Hepatitis A, B, and C
• Tobacco mosaic virus
There are NO Treatments for
Viruses!
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18.2 Archaebacteria and Eubacteria
Eubacteria
• Archaebacteria
• Commonly cause disease and decay
• Reproduce by binary fission ­ asexual cell division
• Have a circular chromosome
Live in harsh environments Typical Bacterium
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Bacterium in binary fission
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Chapter 18.notebook
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Eubacteria
Eubacteria
• Can be classified according to three things
• Bacterial shapes
Round = coccus
Rod shaped = baccilus
Spiral = spirilum; spirochaete = corkscrew shape
Shape
Mode of nutrition
Gram­stain test
diplo=2
strepto=chain
staphylo=grape­like cluster
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Name that Bacterium
Eubacteria
• Modes of nutrition
Heterotrophic Autotrophic Ex. cyanobacteria
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Eubacteria
The Importance of Bacteria
• A gram­stain test is used to detect the composition of the cell wall
• Food production
• Nitrogen­fixation
• Help recycle nutrients through decomposition
Gram +
Gram ­
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Chapter 18.notebook
May 08, 2015
Bacterial Diseases
• Strep throat
• Tuberculosis
• Tetanus
• Lyme disease
• Cavities
Go to page 452!
Treat
with Antibiotics
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May 7­8:05 AM
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