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Unit 2 Micro
Transcript of Unit 2 Micro
a cytoplasmic membrane surrounded by a peptidoglycan cell wall and maybe an outer membrane
a fluid cytoplasm containing a nuclear region (nucleoid) and numerous ribosomes; and often various external structures such as flagella, and pili.
The characteristics of prokaryotic cells:
single-celled, microscopic organisms
generally much smaller than eukaryotic cells.
very complex despite their small size.
peptidoglycan prevents osmotic lysis
Gram-positive bacterium will appear PURPLE in a microscope after the Gram stain procedure.
examples: (take your pick!)
Streptococcus pneumoniae, Staphylococcus aureus
Staphylococcus epidermidus Enterococcus faecalis
Gram-negative bacterium will appear PINK in a microscope after the Gram stain procedure.
any Salmonella species
Escherichia coli (you have this one!)
Acid-fast bacterium will appear RED in a microscope after the acid-fast stain procedure.
The three basic shapes of bacteria.
Rod or bacillus
Bacteria are always prokaryotic!
5 different arrangements of cocci.
Diplococcus - Division in one plane; cocci arranged in pairs
Streptococcus - Division in one plane; cocci arranged in chains
Tetrad - Division in two planes; cocci arranged in a square of four
Sarcina - Division in three planes; cocci arranged in cubes of eight
Staphylococcus - Division in random planes; cocci arranged in grape-like clusters
2 different arrangements of bacilli.
Bacillus - Division in one plane; rods completely separate after division.
Streptobacillus - Division in one plane; rods arranged in chains.
3 different spiral forms of bacteria.
Vibrio - A curved or comma shaped rod
Spirochete - A thin, flexible spiral
Spirillum - A thick, rigid spiral
antimicrobial agents control bacterial by
inhibiting normal synthesis of peptidoglycan in bacteria causing them to burst as a result of osmotic lysis.
antimicrobial agents control bacterial by inhibiting normal synthesis of peptidoglycan in bacteria causing them to burst as a result of osmotic lysis.
Unit 2 Study Guide