BACTERIA ARE SINGLE-CELLED ORGANISMS WITHOUT A NUCLEUS

1
BACTERIA ARE SINGLE-CELLED ORGANISMS WITHOUT A
NUCLEUS

• Bacteria are the simplest form of life there
  are more bacteria in your mouth than people on
  the planet.
• BACTERIA ARCHAEA are the SMALLEST LIVING
  things.
• BACTERIA ARCHAEA are found in MANY ENVIRONMENTS
• BACTERIA MAY HELP OR HARM OTHER ORGANISMS

2
BACTERIA ARCHAEA are the smallest living things

• Bacteria are the simplest kind of life known
  (1cell with loops of genetic material-no nucleus
  reproduces via binary fission)
• Bacteria have cell walls surrounding protecting
  the soft cell membrane.
• Classify bacteria by external shape
• SPIRAL-shaped occur in single strands
• ROD-shaped occur singly or in chains
• ROUND-shaped occur singly, in pairs, chains or
  clusters.

3
(No Transcript)
4
ARCHAEA BACTERIA IN MANY ENVIRONMENTS

• ARCHAEA single-celled organisms living in the
  most extreme environments (hot, cold, salty,
  etc.)
• METHANOGENS archaea that make methane die if
  exposed to oxygen (live in marshes intestines
  of cows termite)
• HALOPHILES archaea that live in salty lakes
  ponds
• THERMOPHILES archaea that live in extreme heat
  or cold. (hot springs, under water volcanic
  vents, or buried deep in ice).

5
ARCHAEA BACTERIA

• Some bacteria have chlorophyll use sunlight for
  energy. (important food source in oceans give
  off O2 as well)
• Many bacteria are grouped by role they play in
  environment
• PRODUCERS transform energy from sunlight to
  usable forms.
• DECOMPOSERS break down materials in dead or
  decaying organisms. (good recyclers!)
• PARASITES organisms that live off a host and
  harm that host

6
(No Transcript)
7
Helpful v. Harmful Bacteria

• Decomposers break down material that other
  organisms can use to build up.
• Can break down treat sewage to clean water or
  oil spills
• Can convert nitrogen gas into usable nitrogen
  compound for plants to use in building proteins
  to grow.
• Methanogen archaea also help cows termites
  digest cellulose for food.

• Some diseases are caused by bacteria
  (tuberculosis, cholera, infant diarrhea)
• Cause symptoms by
• Invade body, multiply dissolve cells
• Poison with chemicals they made released
• Poison with chemicals that are part of themselves
• VACCINES are used to help organisms get ready to
  fight bacteria they may be exposed to in the
  future.