Transcript Bacteria - Mrs. Brenner`s Biology

Bacteria
Life Science
Chapter 9, section 2
E. Coli and the
Bacteriophage
What it looks like in real life
Bacteria Cell
DNA
Bacteria



Cells that do not have a
nucleus
Exist almost everywhere
on earth
Grow in numbers so great
you can see them with
the unaided eye
Eubacteria (True bacteria)
Generally are
surrounded by a cell
wall
Cyanobacteria






Photosynthetic
bacterium
Bluish-greenish color
Can do photosynthesis
No chloroplasts
Found nearly
everywhere on earth.
Can survive in extremely
hot environments and
even extremely cold
environments
Archaebacteria
 Can survive
extremely harsh
environments
 Do not require
oxygen
 Can live in
extremely salty
environments
 Can live in
extremely hot
environments.
Categories of Bacteria
Cell Shape
Movement
How they get food
Do they need oxygen
How they reproduce
Bacterium Shapes
 Sphere
shaped
bacteria
 Rod shaped bacteria
 Spiral shaped
bacteria
Movement
• Flagella ~ Tail-like structure that
whips around to propel the
bacterium
• Cilia ~ Lots of miniature flagella
surround the cell and help to
“swim”
• Non-motile ~ Sticky cilia-like
structures that keep the bacterium
from moving
Flagella
Bacteria and their energy
 Autotrophs
 Chemotrophs
 Heterotrophs
Autotrophs
Make
their
own food
Capture sun
energy
Cyanobacteria
Chemotrophs
 Make
own food
 Use Chemical
energy
 Types of
Archaebacteria
Heterotrophs
 Have
to
consume
food
 By eating
 Example:
E. coli
Oxygen requirements
 Some
live without Oxygen
 Some can live with or
without oxygen
 Some cannot live without
oxygen.
Bacteria Reproduction
Binary
Fission
Conjugation
Cellular organism copies its genetic information then splits into
two identical daughter cells
Conjugation


Requires TWO
organisms
Results in swap of
genetic information