Bacteria & Viruses Also Known As… Why We Beat the Aliens at the End of “ War of the Worlds” Bacteria – Basic Info Bacteria were the first forms of life on the planet. They arose from the organic soup of the primordial Earth. There are several characteristics that all bacteria have in common:
Also Known As…
Why We Beat the Aliens at the End of “War of the Worlds”
Cell Wall – Protection
Cell Membrane – In & Out of Cell
Cytoplasm – Fluid interior
Ribosomes – Protein builders
Pili – Connect & Trade DNA
Flagella – MovementStructure of Bacteria
Cocci – Spherical
Bacilli – Rod-shaped
Sprilli – Spirals
No prefix – Solo
Diplo – Pairs
Strep - Chains
Staph - ClustersBacterial Shapes
Gram negative bacilli bacteria.Gram Stain & Bacteria
Make their own energy compounds.
Photoautotrophs – use photosynthesis – energy in sunlight.
Chemoautotrophs – gain energy from simple inorganic compounds.
Must consume other materials to gain energy.
Symbiotes – bacteria live in close association with host.
Parasites – live in host – negative effects.
Saprobes – eat dead and/or decaying matter.Nutrition
Anaerobic respiration does not require oxygen to make energy (ATP).
Obligate anaerobes must live in the absence of oxygen. Oxygen is toxic to them and will kill them if present.
Facultative anaerobes do not use oxygen but can survive just fine if it is around.
Aerobic respiration requires oxygen to make ATP.
Obligate aerobes must have oxygen to make ATP or they die. They can not live in the absence of oxygen.Bacterial Respiration
Old school bacteria from the harshest places on Earth that resemble the primordial Earth.
Methanogens – release methane gas (CH4).
Thermophiles – live in very hot places.
Halophiles – live in very high concentrations of salt.
Most of the prokaryotes on Earth are eubacteria.
They inhabit almost all places on Earth and show a great deal of diversity within the kingdom.Bacterial Kingdoms
A virus is a non-cellular piece of genetic material surrounded by protein that lives within a host cell.
Viruses are not part of any of the six kingdoms.
Viruses are classified according to their structure and the type of host cell they inhabit.
The word “virus” means poisonous slime of plant or animal origin.Viruses – Basic Info
Has biomolecules like proteins and nucleic acids.
Has DNA or RNA.
Capable of directing reproduction.
Able to evolve.
Able to respond.
Not made of cells.
Can not grow or reproduce outside of host cell.
Can’t run protein synthesis without host cell.
Lacks enzymes for cellular respiration.To Live or Not To Live…
Viral DNA is injected.
Viral DNA uses host cell machinery to make viral parts.
Viral parts are assembled.
Enzyme created to destroy host cell’s cell wall – lysis!The Lytic Life Cycle