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cell structure
microbiology
17
Biology
Undergraduate 2
06/11/2008

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Term
Eukoryote
Definition
-membrane enclosed nucleus, organelles, DNA
-DNA arrangement linear
-no peptidoglycan
-mitosis
-meiosis
-no binary fission
Term
Prokaryote
Definition
-no membrane enclosed nucleus, organelles, DNA
-DNA circular
-peptidoglycan present in bacterial cell walls
-no mitosis
-no meiosis
-binary fusion
Term
three basic bacterial shapes
Definition
-cocci > spherical
-Bacilli > rod-shaped
-Spirilla > spiral-shaped
Term
categories of cocci
Definition
-diplococci > cocci in pairs
-streptococci > cocci in chains
-Sarcinae > cocci in clusters
Term
categories of bacilli
Definition
-diplobacilli > bacilli in pairs
-streptobacilli > bacilli in chains
-coccobacilli > bacilli that are almost spherical
Term
Categories of spirilla
Definition
-Vibrioids > less than one complete turn
-helical bacteria > at least one complete turn
-spirochetes > spirilla that look like wire curls
Term
glycocalyx
Definition
-outer coating
-either distinct as capsule or diffuse as slime layer
-protects
-adhesion to surfaces
Term
flagella
Definition
-whiplike appendage mostly serving locomotion
-monotrichous > 1 flagella
-amphitrochous > flagella at both ends
-lophotrichous > flagellum at one pole
-peritrichous > entire surface
Term
major flagellar components
Definition
-filament: structure projecting out of bacterium
-hook: connects basal body w/ filaments
-basal body: anchors the hook, penetrates both cell wall and cell membrane
Term
Axial filaments
Definition
-fibers arising at one end of the bacterium and spiraling around it
-locomotion
Term
fimbriae and pili
Definition
-hair-like appendages
-attachment to surfaces
-attachment to other bacteria
Term
plasma membrane
Definition
phospholipid bilayer
selectively permeable
Term
cytoplasm
Definition
liquid within plasma membrane
contains DNA, ribosomes, inclusions, and organic molecules
Term
inclusions
Definition
bacterial storage deposits
Term
endospores
Definition
-resting structures formed by some bacteria
-triggered by adverse nutritional conditions
-cannot survive in a pH lower than 4.5
Term
sporulation
Definition
process of forming endospores
Term
germination
Definition
process of returning to the vegetative state
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