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Bacteria
Rashelly Cruz
October 30, 2014
What is bacteria?
• Small organisms that are hard to see
• Exist around all the environments of the
world
• Ex: dirt, water, caves and hot spring.
Especially inside all the bodies of every
living animal on earth.
Formation
• Bacteria comes in three shapes
1. Rod-shaped often called a bacillus
2. Cocci
3. Spherical
• As diverse as their shapes are
prokaryotic cells also have different
methods to move around the
environment.
Prokaryotic Cell Structure
Bacteria Reproduction
• They reproduce
asexually
• Reproduction
occurs by
binary fission.
• During binary
fission, the
single DNA
molecule
replicates and
both copies
attach to the
• Cell wall forms dividing the original cell
cell membrane.
into two identical daughter cells.
Early Classification
Characteristics
•
•
•
•
Photosynthetic or nonphotosynthetic
Motile or Nonmotile
Unicellular or colony-forming or filamentous
Formation of spores or division by transverse
binary fission
• Importance as human pathogens or not
Pathogenic Bacteria
• Some bacteria can cause disease.
• Some notable pathogenic bacteria
include streptococcus,
Staphylococcus, Tuberculosis,
and Escherichia coli.
• Pathogens can make you sick
• Avoid it by washing your hands
before you eat something.
Cell Wall
• Bacteria is protected by the cell wall composed
of peptidoglycans
• It’s located on the outside of the membrane
• Found in plants, fungi, bacteria, algae and
archaea
• Peptidoglycans gives bacteria structural
support
Review
• Bacteria are small organisms
• They come in three different
shapes: cocci, bacilli, and
spherical
• Prokaryotic cell structure
includes the cell wall,
plasma membrane,
cytoplasm, ribosomes and
more.
• It reproduces by binary
fission