genetic material

What are bacteria like?

flagellum

capsule

cell wall

cellmembrane

cytoplasm• Unicellular• Prokaryote• Most are heterotrophs.• Some form colonies.• Habitat: all types

Bacteria nutrition

Photosynthesis

Parasites

Saprophytes

Heterotrophs Autotrophs

Symbionts

• live in the bodies of other living things

intestinal bacteria

Heterotrophs

Bacteria nutrition

• feed off living things• cause illnesses (tuberculosis, cholera)

Symbionts

• live on dead or decomposing matter • are used to make food

milk

cheese

yoghurt

Parasites

Saprophytes

Bacteria nutrition

PHOTOSYNTHESIS

oxygen + organic substances

cyanobacteriaAutotrophs

carbon dioxide

How are bacteria classified?

spherical

Coccus

curved -rod shaped

Vibrio

Bacillus

rod-shaped

Spirillum

helical

How do bacteria reproduce and interact?

Binary fissionminutes

0

30

60

90

1.500

1.000

50

Time (in hours)5 15 20

unfavourable

growth of bacteria

Environmental conditions

Sporulation

amount of bacteria (in millions)

favourable

resistant spores