The Bacterial Cell
Bacteria are prokaryotic
(lack a nucleus)
Shape of Bacteria
 Round – cocci
 Example – strep – throat
(Streptococcus)
Shape of Bacteria
 Rod-shaped - bacilli
 Example – E. coli
(Escherichia coli)
Usually found in the intestines
Shape of Bacteria
 Spiral shaped – spirilla
Example – Lyme disease
(Borrelia burgdorferi)
Movement of Bacteria
Flagella – a long whip-like
structure that helps the cell
move by spinning in place like a
propeller.
 A bacterial cell
can have many
flagella, one or
none.
 If a bacterial cell
does not have a
flagella, they
depend on air,
water or clothing
to carry them
around.
Obtaining Food
 Autotrophs – make their own
food.
Obtaining Food
 Heterotrophs – obtain food
by eating autotrophs or other
heterotrophs.
Types of Bacteria
 Helpful Bacteria
Food: cheese, sauerkraut, pickles,
sour cream and yogurt
Harmful Bacteria
 Illness and
Health
–Strep throat
and food
poisoning
Antibiotic
A chemical that can kill
bacteria.