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Unit 2 Micro

Unit review
by

Gary Noble

on 22 April 2010

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Transcript of Unit 2 Micro

the various structures that make up a typical bacterium.

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 pyogenes
Streptococcus pneumoniae, Staphylococcus aureus
Staphylococcus epidermidus Enterococcus faecalis
Clostridium species
Gram-negative bacterium will appear PINK in a microscope after the Gram stain procedure.

Examples:

any Salmonella species
Neisseria gonorrhoeae
Neisseria meningitidis
Haemophilus influenzae
Escherichia coli (you have this one!)
Acid-fast bacterium will appear RED in a microscope after the acid-fast stain procedure.

Examples:

Mycobacterium tuberculosis
Mycobacterium leprae
The three basic shapes of bacteria.
Rod or bacillus
Coccus
Spiral
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.
Microbiology
Unit 2 Study Guide
Full transcript