013368718X_CH20_313-324.indd
Name Answer Key Class Date 7.3 Cell TransportLesson Objectives2730542545Describe passive transport.2730529845Describe active transport.-2984564135BUILD VocabularyA. The chart below shows key terms from the lesson with their definitions. Complete the chart by writing a strategy to help you remember the meaning of each term. One has been done for you.TermDefinitionHow I’m Going to Remember the MeaningDiffusionMovement of particles from an area of higher concentration to an area of lower concentrationDiffusion happens when the concentrations of particles are different.Facilitated diffusionDiffusion of molecules through a protein channelFacilitate = help Proteins help materials diffuse across membrane HypertonicSolution with more solute than another solutionHyper = more/above ; hypertonic = more solute in solution HypotonicSolution with less solute than another solutionHypo = less; less solute outside Hyp- O; Bel-OW (same sound) IsotonicTwo solutions that have the same amount of soluteIso = same Isotonic = equal concentrations OsmosisDiffusion of water through a selectively permeable membraneH2O = water , Osmosis starts with O B. As you work through this lesson, you may find these terms in the activities. When you need to write a key term or a definition, highlight the term or the definition.101Name Class Date 6350137160BUILD UnderstandingCompare/Contrast Table Use a compare/contrast table when you want to see the similarities and differences between two or more objects or processes. Select words or phrases from the box to complete the table comparing passive and active transport.diffusionenergy requiredexocytosisosmosis endocytosisenergy not requiredfacilitated diffusionprotein pumpsPassive TransportActive TransportDiffusionenergy not requiredfacilitated diffusionosmosisenergy requiredendocytosisexocytosisprotein pumpswatersoluteparticlesmembraneDiffusionofSoluteParticlessolute particle movementOsmosiswater movementPassive TransportDiffusion is the movement of particlesfrom an area of high concentration toan area of low concentration. Osmosisis the diffusion of water through aselectively permeable membrane.Study the beakers at the right. Thearrows between beakers tell youwhat process is occurring.1. In the beakers on the right,draw the result of the describedprocess. Draw changes in waterlevels. Draw changes in the numberof solute particles. Remember todraw on both sides of themembrane.The picture on the top right (diffusion of solute particles) should show an equal concentration of solute on both sides of the membrane, since the membrane is permeable to solutes). The picture on the bottom right (diffusion via osmosis) should show an increase in water level on the left hand side, and therefore an even ratio of water and solute molecules. 2. Look at the top left beaker. Whatwould happen if the membrane didnot allow water or solute particlesto pass through it?Nothing . If the membrane is not permeable to solute or water nothing can/would change. 102Name Class Date Active TransportFacilitated diffusion takes place when a substance diffuses across the cell membrane through a protein channel. Active transport takes place when the cell uses energy to carry a substance across the cell membrane against a concentration difference.Follow the directions.1. Label each diagram as either facilitated diffusion or active transport.facilitated diffusion active transport Glucose moleculesMolecule tobe carriedEnergyMoleculebeing carriedAnswer the questions. Circle the correct answer.2. Which process can move molecules from a lower concentration solution on one side of the membrane to a higher concentration solution on the other side?active transport facilitated diffusion3. Which process does not require energy?active transport facilitated diffusion4. What does the word facilitated mean in facilitated diffusion ?hindered helped103 ................
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