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Transcript
CELL TRANSPORT QUESTIONS Define HOMEOSTASIS? Define DIFFUSION? Why is the cell membrane said to be selectively permeable? How does the cell membrane help maintain homeostasis? Diagram and label a section of a cell membrane (include what parts are hydrophobic and hydrophilic) Online Activity 6.2 –Dissect a Cell Membrane Cells and their organelles have unique selectively permeable boundaries, called membranes, which are composed primarily of phospholipids and proteins. Why do the phospholipid molecules arrange themselves in that pattern when they are poured into the beaker of water? Why is the membrane described as a phospholipid bilayer? Online Demo 6.3 Questions ***During this exercise yellow dialogue boxes will pop up to help you answer these questions. What properties of carbon dioxide and oxygen allow them to easily cross a membrane? What property of the sodium ion prevents it from crossing a membrane? What properties of glucose prevent it from easily crossing a membrane? How did the large glucose molecule cross the membrane? Why do you think that water, a small molecule, needs a transport protein to move rapidly through the membrane? Why do you think K+ and Na+ need energy to move across the membrane?
