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21 Cards in this Set

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Prions
Protein/Proteinaceous Infectious Particles
Prions
Self-replicating, devoid of nucleic acid.

100x smaller than the smallest virus.
Prions
Cause "slow infections" (months - decades - years) before symptoms.

Amyloid plaque found in CNS.
Scrapie
Prion
Fatal brain disease in sheep.

Dementia - spasms - coma - death
Creutzfeldt-Jakob Disease
Prion
Worldwide
Humans aged 50 to 70 years old.
Kuru
Prion
Fore tribe in New Guinea
Trembling - shivering - coma death
Viroids
"Virus like"
Linear and Circular RNA.

10x smaller than smallest plant virus (Lack a protein coat)

Cause a number of plant diseases.

Infect: Chrysanthemums, potatoes, cucumbers, citrus trees, coconuts.
Viruses
RNA or DNA (Single or double stranded)
infect many life forms.
Rickettsias and Chlamydias
Unicellular
Prokaryotic
Lack a true nucleus or membrane bound organelles.
Obligate intracellular parasites.
Reproduce only within a host cell.
Rickettsias and Chlamydias
Bacteria and Archea
Lack a true nucleus or membrane bound organelles. (4)
Rickettsias and Chlamydias
Obligate intracellular parasites.
Rickettsias and Chlamydias
Reproduce only within a host cell
Bacteria and Archaea
Unicellular
Prokarotic
Range from Antartic Ice to Steaming geysers
No membrane-bound nucleus
Most are saprophytic
Live on dead and decaying organic matter
Bacteria and Archaea
Range from Antartic Ice to Steaming geysers
Bacteria and Archaea
Fungi
Live on dead and decaying organic matter
Algae
Unicellular photosynthetic organisms
Fungi
Yeast, Molds, and mushrooms
Nonphotosynthetic
Most are saprophytic
Protozoa
Unicellular Animals
Eukaryotic
Most are free-living
Some are symbiotic (Living in close relationship with another organism)
Some are parasites.
Helminths
Roundworms and flatworms

Free-living and parasitic
Diphyllobothrium latum
Eg. of Helminths
Fish tapeworm
Can be up to 30 feet in length.
Microbiology
The study of organisms too small to be seen clearly with the unaided human eye.