BSC2010 Test 2 Flashcards - Flashcard Exchange

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Membrane Function	Organizes chemical activities of cell separates cells from outside environment controls passage of molecules across membranes partitions organelle function in eukaryotes provides reaction surfaces and organizes enzymes and their substrates
Membrane Structure	Phospholipids of membranes form bilayers phospholipids have polar “head” and nonpolar “tail”
Intergral and Peripheral Proteins	I: Transmembrante P: On the membrane surface
Protein Functions	-Itentification -Receptors -Cell Junctions -Transporters
Isotonic	Solutions of equal solute concentration
Hypotonic	More solvent than solute hypO...more h2O
Hypertonic	More solute than solvent
Uniports	One substance in one direction
Symport	2 substances; same direction
Antiports	2 substances; opp. directions
Aquaporins	Rapid water transport channels
exocytosis	membrane-bound vesicles containing large molecules fuse with plasma membrane and release contents outside cell
Endocytosis	plasma membrane surrounds materials outside cell, closes around materials, and forms membrane-bound vesicles
(delta)G	Free energy available to do work in a cell The measure of free energy It never changes!
A-(delta)G=	A reaction gives off energy; it provides power
A+(delta)G=	A reaction needs energy
endergonic reactions	require input of energy
exergonic reactions	release energy
ADP + PO4 (a phosphate) =	ATP
Factors that affect enzyme activity	Temperature pH Salt concentration (ions) Presence of co-factors

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