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49 Cards in this Set

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  • Back
A microorganism that grows at acidic pH’s
A protein in bacterial pili that assists in attachment to the surface molecules of cellsof their host.
A microorganism that grows at basic pH’s
Basal body
A structure at the base of a bacterial flagellum having a central rod and set of enclosing rings.
Binary fission
An asexual process by which a cell divides to form two new cells; specifics of the process vary among organisms
Cardinal temperatures-
The minimal, optimal, and maximum temperatures at which bacteria grow.
A movement toward a chemical attractant
The outer layer, the cortex, develops around the forespore during formation of a bacterial spore.
any of a group long chain polymers of glucose with various molecular weights that are used in confectiosn, as food additives and as plasma volume expanders
Differential medium
A growth medium in which different species of microorganisms can be distinguished.
Diplicolinic acid
An organic substance that helps stabilize the proteins in a bacterial spore, thereby increasing spore resistance.
An extremely resistant dormant cell produced by some gram-positive bacteria.
A metabolic poison produced chiefly by Gram-negative bacteria;
Enriched media
containing special nutrients
F pilus or sex pilli
During conjugation-one bacterial cell(F+) will have a pili and it can mate with an (F-) cell, then it becomes thicker and hollow and is called a conjugation bridge, and through this bridge DNA can be transferred from one cell to another
A short, hairlike structure used by bacteria for attachment
The hollow filament is composed of long, rigid and helical strands of protein subunits called flagellin.
Generation time-
The time interval between bacterial divisions; varies among bacteria and can be as brief as 20 minutes.
A layer of capsule or slime around certain bacteria that assists in attachment to a surface and imparts resistance
An organism that lives in environments with high concentration of salt.
Inclusion body-
A granulelike storage body that forms in the bacterial cytoplasm
Lipid A
Is a part of the lipopolysaccharide layer of the gram-negative cell wall
A molecule composed of lipids and polysaccharides, found in the outer membrane of gram-negative bacteria
Metachromatic granules
a phosphate-storing granule that stains deeply with methylene blue; known as volutin granule.
Nitrogen fixation
A general term for the chemical process in which organisms trap atmospheric nitrogen and use it to form organic compounds.
– a complex molecule of the bacertial cell wall composed of alternating units of NAM and NAG
Periplasmic space
contains several enzymes that process molecules before they enter the cytoplasm
are protein appendages that appear as short hair-like fibers, which are composed of pilin, there can be sex pili and attachment pili. The attachment pili anchors the bacteria,to a surface such as tissue via adhesins, which in turn increases its disease causing capabilities
A protein subunit found in the bacterial pilus
A small, closed-loop molecule of DNA apart from the chromosome
occurs when a plant cells membrane shrinks away from its cell wall.
Standard plate count, must accurately dilute the culture & put a measured volume of the serial dilutions onto a suitable growth medium, the number of colonies which grow on the agar indicate the number of live cells in the original culture
Selective media
A growth medium that contains ingredients to inhibit certain microorganisms while encouraging the growth of others.
Slime layer
A thinner, flowing, and less tightly bound form of a glycocalyx
helical shaped, with a rigid cell wall and a flagella for movement
corkscrew shape, a flexible cell wall & no flagella, contains axial filaments for motility, or contractions of the cell.
grape, grape like clusters
An interrelationship between two populations of organisms where there is a close and permanent association for mutual benefit.
Teichoic acid
A polysaccharide found in the cell wall of gram positive bacteria
a group of 4 cocci that result from division in two planes
Vegetative cell
cells that are actively growing & reproducing
Viable count
The number of living organisms within a sample
curved rods that resemble commas.
_____ is the collective name give to the combination of cell membrane, cell wall and capsule in bacteria
cell envelope
__________ is the term often applied to the chromosomal region of bacterium
________________ is the organic compound that helps stabilize bacterial spores and is only found in endospores
dipicolinic acid
__________ organisms require a partial pressure of carbon dioxide greater than normal in order to grow well
The gram postiive cell wall is composed primarily of ____________ with _____ woven into a latticework
peptidogylcans, teichoic acid