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17 Cards in this Set

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Spontaneous generation
Life from nonliving materials. Disproved by Redi and Pasteur
What composes the largest biomass group of living organisms?
Microorganisms
Nitrogen fixation
converting atmospheric nitrogen (gas) to biomolecules (e.g. nucleic acids, amino acids, etc.)
Oxygen production
Convert carbon dioxide to molecular oxygen (O2)
What are two examples of microorganisms degrading organic materials?
GI tract and sewage treatment plant
Zoonotic agents
The hosts that new infectious agents inhabit in the wild
Bacteria
-Prokaryotes
-Most have rigid cell walls composed of peptidoglycan
Archea
AKA: extremophiles
-Similar to bacteria but no peptidoglycan
-Found in extreme environments
Eucarya
-Complex organelles
-Larger than bacteria and archea
-Includes algea, fungi, protozoa
Viruses are:
-Complex microorganisms
-Not considered alive
-obligate intracellular parasites
Viruses are __________, not killed.
inactivated
Viruses tend to be _________-specific.
Species
Discuss virus host relationships including reservoir hosts, species "jumps".
Viruses reside in a reservoir host (like the hantavirus in the deer mouse) and cause disease when the virus "jumps" species (like the hantavirus in humans).
Humans infected with Sin Nombre virus often develop what?
hantavirus cadiopulmonary syndrome (33% death rate)
Viroids
-Composed of RNA
-Smaller then viruses
-Rely on other viruses to replicate
-Best characterized in plants
Prions
-Composed of proteins only
-Cause neurological disease
-Can be transmitted to humans from some animals
Spongiform encephalopathy
The neurological diseases that can be caused by prions