Chapter 3.5 Notes - Lake Central High School
Chapter 3.5 Notes - Lake Central High School
Chapter 3.5 Notes - Lake Central High School
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<strong>3.5</strong> Active Transport, Endocytosis, and ExocytosisKEY CONCEPT Cells use energy to transport materialsthat cannot diffuse across a membrane.
<strong>3.5</strong> ObjectivesDescribe active transport.Distinguish among endocytosis, phagocytosis,and exocytosis.
<strong>3.5</strong> Active Transport, Endocytosis, and ExocytosisActive transport requires energy input from a celland enables a cell to move a substance against itsconcentration gradient.• Passive transport requires no energy from the cell.• Active transport ispowered by chemicalenergy (ATP).• Active transport occursthrough transport proteinpumps.• Cells use active transportto maintain homeostasis.
<strong>3.5</strong> Active Transport, Endocytosis, and ExocytosisA cell can import and export large materials or largeamounts of material in vesicles during theprocesses of endocytosis and exocytosis.• Cells use energy to transport material in vesicles.• Endocytosis is the process oftaking material into the cell.• Phagocytosis is a type ofendocytosis.
<strong>3.5</strong> Active Transport, Endocytosis, and ExocytosisA cell can import and export large materials or largeamounts of material in vesicles during theprocesses of endocytosis and exocytosis.• Cells use energy to transport material in vesicles.• Exocytosis is the process ofexpelling material from thecell.
<strong>3.5</strong> Assessment: How do transport protiensthat are pumps differ from those that arechannels?Pumps require energy, transport a moleculeagainst its concentration gradient, andchange shape upon binding. A proteinchannel does not change shape or requireenergy. It allows certain molecules todiffuse through it, down their concentrationgradient.
<strong>3.5</strong> Assessment: How do endocytosis andexocytosis differ from diffusion?They require energy input; diffusion does not.They also enable larger particles to enter acell, particles that are too large to diffuseacross a cell membrane.
<strong>3.5</strong> Assessment: Small lipid molecules are inhigh concentration outside a cell. Theyslowly cross the membrane into the cell.What term describes this action? Does itrequire energy?DiffusionNo
<strong>3.5</strong> Assessment: Ions are in lowconcentration outside a cell. They moverapidly into the cell via protein molecules.What term describes this action? Does itrequire energy?Active transportYes
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