Term
Is cell morphology a good predictor of other properties of the cell? |
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Definition
Morphology typically doesn't affect other various properties but it could affect things like nutrient/ion uptake and movement abilities |
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Term
What physical property of cells increases as cells become smaller? |
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Definition
Their surface-to-volume ratio increases as they get smaller |
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Term
Contrast the linkage between glycerol and the hydrophobic portion of lipids in bacteria and archaea |
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Definition
Glycerol is facing outwards on either side of the membrane while the hydrophobic portions are facing inwards |
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Term
List 2 reasons why a cell can't depend on diffusion as a means of acquiring nutrients |
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Definition
Some compounds are just flat out too big to diffuse through the membrane and various nutrients that have a certain charge associated with them can't be passed through the membrane either |
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Term
Why is peptidoglycan such a strong molecule? |
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Definition
It's a very rigid molecule and its structure is interlinking |
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Term
What does the enzyme lysozyme do? |
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Definition
It degrades the bond between the N-acetylmuramic with the fourth carbon of N-acetylglucosamine which essentially destroys the cell wall |
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Term
What components constitute the LPS later of gram - bacteria? |
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Definition
LPS consists of the core polysaccharide and O-polysaccharide |
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Term
Why does alcohol readily decolorize gram - but not gram + bacteria? |
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Definition
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Term
What is the ABC (ATP binding cassette) transport system? |
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Definition
The ABCTS is a membrane transport system consisting of three proteins, one of which hydrolyzes ATP, which transports specific nutrients into the cell |
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Term
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Definition
The basal body is the "motor" portion of the bacterial flagellumm, embedded in the cytoplasmic membrane and wall |
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Term
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Definition
A capsule is a polysaccharide or protein outermost layer, usually rather slimy, present on some bacteria |
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Term
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Definition
Chemotaxis is the directed movement of an organism toward (positive chemotaxis) or away from (negative chemotaxis) a chemical gradient |
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Term
What is dipicolinic acid? |
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Definition
Dipicolinic acid is a substance unique to endospores that confers heat resistance on these structures |
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Term
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Definition
An endospore is a highly heat resistant, thick-walled, differentiated structure produced by certain gram+ bacteria |
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Term
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Definition
A flagellum is a long, thin cellular appendage capable of rotation and is responsible for swimming motility in prokaryotic cells |
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Term
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Definition
Gas vesicles are gas-filled cytoplasmic structures bounded by protein which confer buoyancy on cells |
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Term
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Definition
Gram- bacteria are prokaryotic cells whose cell wall contains small amounts of peptidoglycan, and an outer membrane containing lipopolysaccharides, lipoproteins and other complex macromolecules |
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Term
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Definition
Gram+ bacteria are prokaryotic cells whose cell walls consist chiefly of peptidoglycan and lacks the outer membrane of gram- bacteria |
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Term
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Definition
A gram stain is a differential stain technique that stains cells either purple (Gram+) or pink (Gram-) |
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Term
What is group translocation? |
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Definition
Group translocation is an energy-dependent transport system in which the substance transported is chemically modified during the transport process |
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Term
What is a lipopolysaccharide (LPS)? |
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Definition
A lipopolysaccharide is a combination of lipid with polsaccharide and protein that forms the major portion of the outer membrane in gram- bacteria |
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Term
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Definition
A magnetosome is a particle of magnetite (Fe3O4) organized into a nonunit membrane-enclosed structure in the cytoplasm of magnetotatic bacteria |
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Term
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Definition
Morphology is the shape of a cell |
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Term
What is the outer membrane? |
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Definition
The outer membrane is a phospholipid and polysaccharide-containing unit membrane that lies external to the peptidoglycan layer in cells of gram- bacteria |
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Term
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Definition
Peptidoglycan is a polysaccharide composed of alternating repeats of N-acetylglucosamine and N-acetylmuramic acid arranged in adjacent layers and cross-linked by short peptides |
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Term
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Definition
The periplasm is a gel-like region between the outer surface of the cytoplasmic membrane and the inner surface of the lipopolysaccharide layer of gram- bacteria |
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Term
What is peritrichous flagellation? |
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Definition
Peritrichous flagellation consists of flagella located in many places around the surface of the cell |
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Term
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Definition
Phototaxis is the movement of an organism toward light |
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Term
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Definition
Pili are thin, filamentous structures that extend from the surface of a cell and, depending on type, facilitate cell attachment, genetic enchange or twitching motility (depending on specific function) |
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Term
What are polar flagellations? |
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Definition
Polar flagellations are organisms which have flagella which eminate from one of both poles of the cell |
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Term
What is poly-(beta)-hydroxybutyrate (PHB)? |
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Definition
PHB is a common storage material of prokaryotic cells consisting of a polymer of (beta)-hydroxybutyrate or another (beta)-alkanoid acid or mixtures of (beta)-alkanoic cells |
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Term
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Definition
The protoplast is an osmotically protected cell whose cell wall has been removed |
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Term
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Definition
The S layer is an outermost cell surface layer composed of protein or glycoprotein present on some bacteria and archaea |
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Term
What is a simple transport system? |
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Definition
A simple transport system is a transporter that consists of only a membrane-spanning protein and typically driven by energy from the proton motive force |
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Term
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Definition
Sterol is a hydrophobic heterocyclic ringed molecule that strengthens the cytoplasmic membrane of eukaryotic cells and a few prokaryotes |
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Term
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Definition
Teichoic acid is a phosphorylated polyalcohol found in the cell wall of some gram+ bacteria |
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