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Chapter 4
micro chapter 4
41
Microbiology
Undergraduate 1
01/23/2011

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Term
Bacteria length
Definition
.2-2 um
Term
coccus
Definition
spherical
Term
bacillus
Definition
rod-shaped
Term
spirillum
Definition
few twists spiral
Term
vibrio
Definition
curved rods
Term
spirochetes
Definition
more twists in a corkscrew shape
Term
diplo
Definition
pairs of bacteria if they divide and remain attached
Term
Staphylo
Definition
clusters of bacteria when they divide in multiple planes
Term
Strepto
Definition
chains of bacteria in one plane
Term
glycocalyx
Definition
capsule, slime layer, or extracellular polysaccharide
Term
capsules
Definition
protect cell from phagocytosis, adhere to surfaces, prevent dessication, provide nutrients, and prevent dehydration
Term
flagella
Definition
long filamentous appendages that consist of a basal body, hook and a long filament. Spin in a prokaryote, move like a whip in a eukaryote
Term
Flagellin
Definition
monomers that are pushed up the flagella and added to the tip, to build up the length
Term
pertrichous
Definition
flagella all around the surface
Term
monotrichous
Definition
one flagella at one end
Term
lophotrichous
Definition
a tuft of flagella at one end
Term
amphitrichous
Definition
flagella at both ends
Term
fimbriae
Definition
help cells adhere to surfaces
Term
pili
Definition
involved in twitching motility and DNA transfer
Term
conjugation
Definition
cell extends pili to other cell, retracts it, pulling the cells closer together then forms a bridge between cytoplasms so DNA can move to the other cell
Term
bacteria cell wall
Definition
made of peptidoglycan, which is made of NAG, NAM and short chains of amino acids.
Term
Penicilin
Definition
Antibiotic that interferes with peptidoglycan synthesis
Term
Gram positive cell
Definition
cell wall consists of many layers of peptidoglycan and also contians teichoic acids
Term
teichoic acids
Definition
regulate the movement of cations in gram positive cells
Term
gram negative cells
Definition
lipopolysaccharide-lipoprotein-phospholipid outer membrane surrounding a thin peptidoglycan layer
Term
Porins
Definition
protiens that permit small molecules to pass through the outer membrane
Term
Lipid A
Definition
endotoxin in the lipopolysaccharide component of the outer layer
Term
Gram stain mechanism
Definition
the crystal violet-iodine complex combines with peptidoglycan. then decolorizer removes the lipid outer membrane from g-neg cells and washes out the crystal violet. The counter stain safranin, stains the gram-neg cells
Term
mycoplasma
Definition
bacterial genus that naturally lacks cell walls
Term
pseudomurein
Definition
in the cell wall of archea, in place of peptidoglycan
Term
plasmolysis
Definition
when water leaves a cell and the cytoplasm shrinks
Term
hypertonic
Definition
water concentration is greater inside the cell
Term
hypotonic
Definition
water concentration is greater outside the cell
Term
metachromatic granules
Definition
inclusion with inorganic phosphate for ATP
Term
polysaccharide granules
Definition
inclusion with glycogen or starch
Term
sulfur granules
Definition
inclusion that stored sulfur for energy
Term
carboxysomes
Definition
inclusion that stores ribulose1,5-diphosphate carboxylase for photosynthesis
Term
magnetosomes
Definition
inclusion with orient bacteria that line up with earth's magnetic field
Term
gas vacuoles
Definition
inclusions filled with air to keep the cell bouyant
Term
80s ribosomes
Definition
found in the cytoplasms or attached to the RER of eukaryotic cells
Term
70s ribosomes
Definition
found in chloroplasts and mitochondria, also in the cytoplasm of prokaryotic cells
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