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Bacteria Notes
Page 266
Bacteria:
• Prokaryotes, so singlecelled organisms without
nucleus and other
organelles like
mitochondria
Flagella:
• A long, whip-like
structure that helps
the cell move
Size and Shape:
• Vary in size
• Spherical
(cocci)
• Rod-like
(bacilli)
• Spiral
(spirochete)
Food
• Some are autotrophs (make food
from sun or chemicals) and some
are heterotrophs (consume other
food)
• When your milk or meat spoils, it’s
because a heterotroph has been
eating it!
Gram
Staining
• A chemical process to classify different bacteria
• Gram + have thick peptidoglycan and 1
membrane
• Gram – have thin peptidoglycan but 2
membranes
E. Coli (-) and S. aureus (+)