Bacteria What do bacteria look like Two new

Bacteria

What do bacteria look like?

Two new kingdoms? ? Eubacteria n n Large variety Live in many different places Archaebacteria n n Ancient bacteria Live in extremely harsh places that would kill most other organisms

Bacterial characteristics Cell Wall of Peptidoglycan Cell Membrane DNA in a ring (plasmid) Some are Heterotrophs (consumers) n Must eat for energy Some are Autotrophs (producer) n Produce their own energy From sunlight From chemicals

How do bacteria move? Flagella n Whip-like structures Slime layer n Goop around Capsule n n Sticky: sticks to stuff Keeps cell from drying out Some don’t move at all

Special Protection Endospore n n Appears when conditions are bad for growth Encloses the DNA Why an endospore? n n Can live through boiling, freezing, and dry conditions When conditions are better, it will break open

Cyanobacteria Photosynthetic n autotroph Aquatic Ancient Often called “blue-green algae” n n This is incorrect! Algae is a plant, but cyanobacteria is a bacterium

Cyanobacteria Lab #1 Gloeocapsa #3 Oscillatoria Fold paper twice to create four quadrants Label each quadrant: n n #1 Gloeocapsa #2 Nostoc #3 Oscillatoria #4 Anabeana Work with a partner Draw and describe what you see! #2 Nostoc #4 Anabeana

Cyanobacteria Lab Answer the following questions based on your observations: n n n Which of the cyanobacteria has a gel-like capsule? Are these cyanobacteria unicellular or multi-cellular? What might be 2 reasons these cyanobacteria are good for the earth? On the next slide tell which is which based on your observations.

A C B D