Download 1.2 Bacteria are single-celled organisms without nuclei Vocabulary

1.2 Bacteria are single-celled organisms without nuclei
Vocabulary
Bacteria
Archaea
Producer
Decomposer
Parasite
Bacteria and archaea
are the smallest living
things
Archaea and bacteria
are found in many
environments
Bacteria may help or
harm other organisms
Simplest life form, one cell without a nucleus
Single celled organisms without nuclei that live in extreme environments
Converts energy from sunlight
Gets energy from breaking down dean or decaying material
Lives in a relationship where it harms the host organism
 Bacteria are found everywhere
 Simplest kind of life known on Earth
 Single celled without a nucleus
 Reproduces by binary fission
 1/10 to 1/20 the size of other cells
 Classified by shape: spiral, rod, round
 Archaea are single celled organisms that survive in extreme
environments
 Classified by where they live:
Methanogens – produce methane, live in swamps and stomachs
Halophiles – live in salty lakes and ponds
Thermophiles – live in extreme heat or cold
 Bacteria are classified by the role they play in their environment:
Producers – transform energy from sunlight into energy for other cells
Decomposers – get energy by breaking down materials in dead or
decaying organisms
Parasites – live in a close relationship with another organism and
harms their host
 Bacteria that are producers or decomposers are helpful to other
organisms
 Some bacteria, such as parasites, can be harmful and cause diseases in
organisms.