Quiz 9 Flashcards
___________ junctions form open channels between cells, allowing direct chemical and electrical communication between cells.
Gap.
____________ junctions form a permeability barrier between epithelial cells, and they prevent the lateral movement of membrane proteins, thereby partitioning the membrane into discrete functional domains. (Most Important).
Tight.
____________ are particularly prominent in tissues that must withstand considerable mechanical stress.
Desmosomes.
_____________ junctions are anchored to the cytoskeleton by linker proteins that attach to actin microfilaments (adherens junctions) or intermediate filaments (desmosomes).
Adhesive.
____________ is responsible for the strength of the ECM, and __________ imparts elasticity.
Collagen, Elastin.
The ECM is held in place by adhesive glycoproteins such as ___________, which link cells to the ECM, and ____________, which attach cells to the basal lamina.
Fibronectins, Laminins.
Cells use cell surface receptor glycoproteins called ___________ to connect to the ECM.
Integrins.
_____________ are membrane-lined cytosolic channels that allow chemical and electrical communication between adjacent plant cells.
Plasmodesmata.
The primary cell wall of a plant cell consists mainly of __________ fibers embedded in a complex network of hemicelluloses, pectins, and extensins.
Cellulose.
The secondary cell wall is reinforced with ___________, a major component of wood.
Lignins.
