The two kingdoms of bacteria: Archaebacteria & Eubacteria
The two kingdoms of bacteria:
Archaebacteria&
Eubacteria
What type of cells?
• Prokaryotes: cells do not have a nucleus
• Eukaryotes: cells have a nucleus
• All bacteria are prokaryotes.
How many cells?
• All bacteria are unicellular.
How do they reproduce?
• Binary fission: simple cell division in which one cell splits into two
• Is this sexual or asexual reproduction?
What shapes are bacteria?
• Most bacteria have a cell wall that determines the shape of the bacteria.
• There are three main shapes of bacteria:
Shapes
Bacilli
What are eubacteria?
• Consumers: obtain energy from other organisms– Decomposers: get energy from dead
organisms– Parasites: invade other cells to obtain food
• Producers: make their own food– Some use photosynthesis
What are archaebacteria?
• Live in places with very harsh conditions.• Three kinds:
– Methane makers: excrete methane and are found in swamps
– Heat lovers: live in places of very high temperature such as ocean vents
– Salt lovers: live in places of very high salt concentration such as the Dead Sea
Bellringer
• How do bacteria reproduce?
• Binary fission
Bacteria
• Prokaryotes (no nucleus)• Unicellular• Reproduce asexually (binary fission)• Three shapes: spirillia,cocci, and bacilli
The Good…for the environment
• Bacteria are essential to the environment.• They take nitrogen out of the air and turn it
into a form that can be used by plants in a process called nitrogen fixation.
• Decomposing bacteria break down dead things and recycle those nutrients so that they are available to other organisms.
The Good… for people
• Bacteria have been manipulated to produce antibiotics to fight different bacteria.
• Bacteria have been manipulated to produce other drugs such as insulin.
The Good…for people
• Bacteria are used in dairy processing to add flavor and add preservatives.
The Bad
• Strep throat• Pneumonia• Tuberculosis• Leprosy• Bubonic plague• Food poisoning• Anthrax