1. Bacteria BY TAMEKA WOOD

2. Characteristics  Lacks a nucleus  A domain in the animal kingdom  Reproduce by binary fission (Divide into two)  Asexual reproduction  The cell membrane is composed of phospholipids bilayers that lack cholesterol and steroids  Rigid cell wall composed of peptidoglycan

3. Bacteria

4.  To replicate, bacteria undergo the process of binary fission, where a bacteria cell grows in size, copies its DNA, and then splits into two identical "daughter" cells.  Bacteria is considered as a living organism because most are composed of a cell, have organization, use energy, can maintain homeostasis, and they have the ability to grow.

5. Cell Wall  Cell wall – protects the cell and maintain its shape, and prevent excessive uptake or loss of water.  This cell wall is composed of peptidoglycan, which consists of a carbohydrate matrix (polymers of sugars) that is cross-linked by short polypeptide units.

6. Cell Wall (CONT.)  The drugs penicillin and vancomycin, interfere with the ability of bacteria to cross-link the peptides in their peptidoglycan cell wall.  Example: When removing all the nails from a wooden house, this destroys the integrity of the structural matrix, which can no longer prevent water from rushing in and swelling the cell to bursting.

7. Phylum: 5 Classifications

8. Archaea

9.  Archaea lacks peptidoglycan. Instead they are composed of: 1. Polysaccharides 2. Proteins 3. Inorganic components  Archaea lipids include saturated hydrocarbons that are covalently attached to glycerol at both ends, their membrane is a monolayer. Archaea with this characteristic cannot adapt to changing environmental temperatures.