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Bio. U4 Yr. 1

QuestionAnswer
What describes the cell (plasma) membrane? Contains cholesterol, is made up mostly of phospholipids and proteins, is selectively permeable, is described as a "fluid mosaic", but NOT allows anything to pass in and out of the cell or is made up mostly of cellulose
What is a function of cholesterol in the cell membrane? Maintains stability at high temperatures and maintains fluidity at low temperatures, but NOT active transport, facilitated diffusion, or bulk transport
What describes transmembrane proteins? Can act as pumps for active transport, contain both hydrophilic and hydrophobic portions, can act as channels for facilitated diffusion, can change shape when a ligand or chemical messenger is attached
True or False? Osmosis is a type of passive transport. True
What can pass into or out of the cell by simple diffusion, passing between the phospholipids? CO2, O2, water, small nonpolar molecules, but NOT glucose, proteins, Na+, K+, ions, or large polar molecules
SimpDiffusion,FacDiffusion=TypeOf_.InvolvesMoveOfSubs_ConcentrationGradientAnd_UseEnergy._IsTypeOfDiffusionRefersSpecificallyToWaterMolecules.WhileWaterMoleculesPassBetweenPhospolipidsBecauseThey're_,PolarMolecules,CanAlsoPassThroughSpecialProteins:_. passive; down; does not; osmosis; small; aquaporins
The concentration of oxygen inside the alveoli is_than the oxygen concentration inside the blood capillaries surrounding the alveoli.Therefore, oxygen moves from the_into the_by_transport. higher; alveoli; blood; passive
True or False? When placed in an isotonic solution, the cell does not change size because molecules stop moving across the membrane. False
In_Solution,AnimalCellShrinkBc_MoleculesMove_CellIntoSurrounding.In_Solution,AnimalCellExpandBcWaterMoleculesMove_CellFromSurroundingSolution.MovementOfMoleculesContinue,AnimalCellCould_.ProcessOfOsmosisInAnimalCellsIsReasonSaline\UsedInMedicalBcIts_. hypertonic; water; out of; hypertonic; into; burst; isotonic
A paramecium is a single-celled, eukaryotic organism that has a ____ to expel excess water taken in by osmosis from its hypotonic environment. contractile vacuole
Adding solute to a solution ____ the water potential of the solution. decreases
A plant tissue placed in a hypotonic solution will... gain mass
What explains why an animal cell may burst when placed in pure water, but a plant cell will not? plant cells have a strong cell wall made of cellulose
The main function of the sodium-potassium is to... maintain a concentration gradient of more sodium ions outside the cell
SodiumPotassiumPumpParticularlyImportantNervousSystem._Transport,UseEnergy_.ProteinPumpChangesShapeMoveSodium&PotassiumIonsAcrossMembrane_ConcentrationGradient.Every_SodiumIonsPumpedOut,_PotassiumIonsPumpedInto.Maintain_ChargeInsideCellComparedToOutside. active; ATP; up; 3; 2; negative
What form of membrane transport uses vesicles? endocytosis, bulk transport, and exocytosis, but NOT osmosis or diffusion
The opening and closing of gated ion channels can be controlled by... voltage changes and ligands
What membrane components functions in cell-cell communication and recognition? glycoproteins
What term refers to a substance that has both hydrophilic and hydrophobic components? amphipathic
In preparing an organ for transplant, the organ should be bathed in a slush that is... isotonic
Created by: user-1907392
 

 



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