Exam #2 - Review Sheet - Exam#2 Review Unit 3 Modules 18-31...

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Exam #2 Review – Unit 3: Modules 18-31 Modules 18-19 -Describe the basic makeup of a cell’s plasma membrane. o Hydrophilic heads = water loving o Hydrophobic tails = water repelling Selective barrier “Fluid Mosaic Model” lateral movement of ? -How do molecules move through the cell membrane? Passive Transport o Diffusion high concentration of molecules low concentration of molecules gases, non-polar molecules o Facilitated Diffusion requires the use of a protein to act as a ‘channel’ water, polar molecules o Osmosis movement of water from high conc. low conc. Describe what these solutions would be like and what would happen to a cell if placed in these types of solutions (in chp. 5 powerpoint): Hypertonic Hypotonic Isotonic Active Transport = requires ATP energy! o moves material against concentration gradient (low conc. high conc.) o must use a protein (ex. sodium potassium pump) -How cells ingest or export material through the cell membrane: Exocytosis = elimination Endocytosis = ingestion o
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