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20 terms

microbio chpt 4

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ABC transport system
a membrane transport system consisting of 3 proteins, one of which hydrolyzes ATP, which transports specific nutrients into the cell.
basal body
a structure resembling a centriole that produces a cilium or flagellum and anchors this structure within the plasma membrane
chemotaxis
in prokaryotes and protists, the movement toward or away from a chemical stimulus, such as the movement toward food or away from a toxin
dipicolonic acid
found in bacterial endospores, pack the chromosome tightly to stay haploid during replication
sterols
lipids between the tails of phospholipids of eukaryotes
hopanoids
sterol-like molecules that stablize the membrane
simple transporter
symporter, antiporter, uniporter
murein
lipoprotein present in Gram-negative outer membrane;
peptidoglycan
A type of polymer in bacterial cell walls consisting of modified sugars cross-linked by short polypeptides.
mucopeptide
The cell wall of a prokaryotic cell (bacteria). Provides shape, rigidity, and protection.
protoplast
a gram(+) cell that has been exposed to lysoenzyme or penicillin and lost its cell wall
lps
an unusual compound found only in the outer membrane of gram-negative bacteria. it is a combination molecule with a lipid moiety on one end and polysaccharide on the other. the lipid end is hydrophobic and the polysaccharide talil is hydrophilic. this serves as a barrier to polar and nonpolar molecules...as a resul, only water and a few gases can cross the lipid par of the outer membrane.
porin
transmembrane protein that forms pores for the facilitated diffusion of small hydrophilic molecules; found in the outer membranes of mitochondria, chloroplasts, and many bacteria.
endospore
a small asexual spore that develops inside the cell of some bacteria and algae, a thick-walled protective spore that forms inside a bacterial cell and resists harsh conditions
flagellin
Subunits of the protein filaments in flagella
fimbriae
hair-like structures that are shorter, thinner, and straighter than flagella - used for attachment, not movement
pili
short, hairlike protein structures on the surface of some bacteria
s-layer
Proteins that form the outermost cell envelope component of a broad spectrum of bacteria, enabling them to adhere to host cell membranes and environmental surfaces in order to colonize.
gas vesicles
gas-filled cytoplasmic structures bounded by protein and conferring buoyancy on cells
magnetosomes
inclusion bodies that allow bacteria to detect magnetic field