Chapter 7.3 & 7.4 Study Guide Answers

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Name Class DateBUILD UnderstandingCompare/Contrast Table Use a compare/contrast table when you want to see thesimilarities and differences between two or more objects or processes. Select words or phrasesfrom the box to complete the table comparing passive and active transport.diffusion energy required exocytosis osmosisendocytosis energy not required facilitated diffusion protein pumpsPassive Transportdiffusionenergy not requiredfacilitated diffusionosmosisActive Transportendocytosisenergy requiredexocytosisprotein pumpsPassive 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.2. Look at the top left beaker. Whatwould happen if the membrane didnot allow water or solute particlesto pass through it?watersoluteparticlesmembraneDiffusionofSoluteParticlesnumber of solute particlesshould be the same on bothsides of the membraneOsmosisnumber of solute particles doesnot change, just level of watersolute particle movementwater movementThe solutions would stay the same. Neither water nor solute particles would movethrough the membrane.Lesson 7.3 • Workbook B • Copyright © by Pearson Education, Inc., or its affiliates. All Rights Reserved.102
Name Class DateActive TransportFacilitated diffusion takes place when a substance diffuses across the cell membrane througha protein channel. Active transport takes place when the cell uses energy to carry a substanceacross the cell membrane against a concentration difference.Follow the directions.1. Label each diagram as either facilitated diffusion or active transport.facilitated diffusionGlucose moleculesactive transportMolecule tobe carriedEnergyMoleculebeing carriedAnswer the questions. Circle the correct answer.2. Which process can move molecules from a lower concentration solution on one side ofthe membrane to a higher concentration solution on the other side?active transportfacilitated diffusion3. Which process does not require energy?active transportfacilitated diffusion4. What does the word facilitated mean in facilitated diffusion ?hinderedhelpedLesson 7.3 • Workbook B • Copyright © by Pearson Education, Inc., or its affiliates. All rights reserved.103
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Chapter 7.3 & 7.4 Study Guide Answers

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