Cell Transportation
Cell Transportation
Objectives
In this lesson, students compare the mechanisms (i.e., active and passive transport) that transport materials across the plasma membrane. Students will:
- Differentiate between active transport and passive transport.
- Compare the mechanisms of passive transport (i.e., diffusion, osmosis, facilitated diffusion) and active transport (i.e., pumps, endocytosis, and exocytosis).
- Describe the role of ATP in active transport mechanisms.
Essential Questions
Vocabulary
- Active Transport: Process that moves materials across the plasma membrane against a concentration gradient; requires energy.
- Carrier Protein: Protein that transports materials into or out of the cell in active transport.
- Concentration Gradient: When a solute in a cell is in high concentration on one side of a membrane compared to the other.
- Diffusion: The movement of molecules across a membrane, with a net movement from high to low concentration.
- Endocyctosis: When a cell actively takes material into itself by folding the plasma membrane inward, forming a vesicle.
- Exocytosis: When a cell actively releases material by folding the plasma membrane outward, forming a vesicle.
- Facilitated Diffusion: Passive movement of molecules across a plasma membrane through protein channels.
- Fluid Mosaic Model: Model of the plasma membrane in which proteins are embedded in phospholipids.
- Isotonic: Two solutions have equal concentrations of solutes.
- Homeostasis: The process by which organisms maintain a stable internal environment.
- Hypertonic: (hyper = above) When comparing two solutions, the solution with a greater concentration of solute.
- Hypotonic: (hypo = under) When comparing two solutions, the solution with a lesser concentration of solute.
- Osmosis: Diffusion of water through a selectively permeable membrane from an area of high concentration to an area of low concentration.
- Passive Transport: Process that moves solutes down their concentration gradient across the plasma membrane; does not require energy.
- Selective Permeability: Property of biological membranes that allows only certain substances to pass through them; the cell membrane and the membranes of organelles are selectively permeable.
- Vesicles: Small membrane-bound spaces in the plasma membrane that transport macromolecules into and out of the cell.
Duration
90 minutes/2 class periods
Prerequisite Skills
Prerequisite Skills haven't been entered into the lesson plan.
Materials
- plastic sandwich bags (non-sealable) (or dialysis tubing, if it can be obtained)
- iodine
- corn starch
- tablespoon
- 200 mL water
- Diffusion Lab (S-B-7-3_Diffusion Lab and KEY.doc)
- Plasma Membrane Diagram (S-B-7-3_Plasma Membrane Diagram.doc)
- Comparing Types of Transport Across the Plasma Membrane (S-B-7-3_Comparing Types of Transport and KEY.doc)
- Passive Transport PowerPoint (S-B-7-3_Passive Transport PPT.pptx)
- computer with Internet connection and projector
- Osmosis (animation) www.stolaf.edu/people/giannini/flashanimat/transport/osmosis.swf
- ATP and Energy Storage (animation) http://biologyinmotion.com/atp/index.html
- Active Transport PowerPoint (S-B-7-3_Active Transport PPT.pptx)
- Endocytosis and Exocytosis (S-B-7-3_Endocytosis and Exocytosis.doc)
- Comparing Passive Transport and Active Transport (S-B-7-3_Comparing Passive Transport and Active Transport.doc)
Related Unit and Lesson Plans
Related Materials & Resources
The possible inclusion of commercial websites below is not an implied endorsement of their products, which are not free, and are not required for this lesson plan.
- ATP and Energy Storage (animation)
http://biologyinmotion.com/atp/index.html
- Active Transport animation
www.mhhe.com/biosci/genbio/biolink/j_explorations/ch03expl.htm
- Animation: How the Sodium-Potassium Pump Works
http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_the_sodium_potassium_pump_works.html
- Transport In and Out of Cells (tutorial)
www2.estrellamountain.edu/faculty/farabee/biobk/BioBooktransp.html
Formative Assessment
Suggested Instructional Supports
Instructional Procedures
Related Instructional Videos
Note: Video playback may not work on all devices.
Instructional videos haven't been assigned to the lesson plan.
DRAFT 05/26/2011