Bacterial Processes Food SourceRespirationReproduction Favorable conditions Survival.
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Transcript of Bacterial Processes Food SourceRespirationReproduction Favorable conditions Survival.
Bacterial Processes
Food Source Respiration Reproduction
Favorable conditions Survival
Food Source
• Photosynthesis – make food using sunlight energy
Food Source
• Chemosynthesis – make food using energy from inorganic chemicals
Hydrogen sulfide
Food Source
• Parasites – living on or in another living organism
Food Source
• Saprophytes – live on a dead organism and decompose it
Respiration
• The breakdown of glucose (food) to release energy
Aerobic Anaerobic
Respiration
• Aerobic – use O₂
Respiration
• Anaerobic – don’t use O₂
hydrogen sulfide and methyl mercaptan
Reproduction
Asexual Sexual
Most bacteria can reproduce either way
Reproduction
• Asexual – binary fission (split in two) – most common means of reproduction
Reproduction
• Sexual – produce genetic variety
Conjugation Transformation
Conjugation
• The exchange of genetic material (plasmids) between 2 cells
Conjugation Example
• http://www.hhmi.org/biointeractive/bacterial-conjugation
Transformation
• Absorption of DNA from the environment
Favorable Conditions
• Warmth• Moisture• Darkness• Food
Survival
• Endospores – a dormant stage of a bacterium to survive unfavorable conditions
Advantage over others?
Endospore
Negative Effects of Bacteria
Pathogenic – disease causing
Bacterial Diseases of Humans
Strep throat
Diptheria
Staph Infection
Tetanus
Gangrene
Pink Eye
Acne
Tooth Decay
Viral or Bacterial Disease?• Tetanus
Viral or Bacterial Disease?• Smallpox
Viral or Bacterial Disease?• Measles
Viral or Bacterial Disease?• Pinkeye
Viral or Bacterial Disease?• Warts
Viral or Bacterial Disease?• Tooth decay
Viral or Bacterial Disease?• Staph Infection
Viral or Bacterial Disease?• AIDS
Viral or Bacterial Disease?• Strep Throat
Viral or Bacterial Disease?• Mono
Viral or Bacterial Disease?• Common Cold
Viral or Bacterial Disease?• Acne
Bacterial Diseases
• Endotoxins – poisonous chemicals inside the bacteria that aren’t released until the bacteria die
• Example – typhoid fever, UTI
Bacterial Diseases• Exotoxins – poisonous chemicals released
from living bacteria as waste
• Example – acne, tetanus
Food Spoilage
• Bacteria eat the food and release bad tasting and/or poisonous chemicals
Prevention
• Refrigerate, freeze, boil and seal, dehydrate, salt
Benefits of Bacteria
Human Body
• E. coli lives in the colon and breaks down food
Human Body
• Bacteria cover our skin and eat bad organisms
Fuels
• Bacteria produce alcohol and methane which are burned for energy
Foods
• Bacteria help make cheese, cottage cheese, and yogurt
Other
• Clean up oil spills
Other
• Sewage treatment
Other
• Make medicines
Insulin
antibiotics