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Published byBranden Carter Modified over 9 years ago
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Also known as the cell membrane – It is so fun!
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To regulate/control what enters and exits the cell. What types of things can get in and out of the cell from passing through the lipid bilayer (without using a protein)? - Tiny non polar molecules (carbon dioxide and oxygen) -water goes through aquaporins
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Through proteins (integral or transmembrane proteins)
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*Know the diagram of a plasma membrane - Phospholipid - Phosphate head is hydrophilic (likes polar molecules like water) - Lipid tail is hydrophobic (prevents molecules like water from crossing the membrane) - Proteins – channel for molecules like water to cross the plasma membrane
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How does the plasma membrane regulate what crosses the cell membrane? What can cross the cell membrane without using a protein?
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1. What types of molecules can cross the cell membrane without using a protein? 2. What types of molecules must use a protein to cross the cell? 3. Draw a phospholipid and name the part that is hydrophilic. Which part is hydrophobic? 4. Explain how the plasma membrane regulates what enters and exits the cell.
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Direction the molecules want to go
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Solutes move from a high concentration gradient to a low concentration gradient. Passive transport/Diffusion: Molecules that cross the cell membrane without using a protein Carbon dioxide Oxygen Facilitated Transport: molecules move through a protein Active transport: molecules move against the concentration gradient (low to high) Must use energy (ATP)
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When water crosses the membrane Water crosses the membrane so that the solute : water ratio will be in equilibrium
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Explain what concentration gradient and equilibrium have to do with homeostasis Must use the following vocabulary words: concentration gradient, diffusion, homeostasis, protein, membrane, equilibrium
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Size: Surface Area and volume The relationship between surface area and volume controls cell size. As a cell gets larger, its volume increases faster than its surface area if the cell maintains the same shape. Concentration Gradient More solutes allow for more transport Energy Use ATP is needed for Active Transport
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Take a look at http://programs.northlandcollege.edu/biology/b iology1111/animations/flagellum.html http://programs.northlandcollege.edu/biology/b iology1111/animations/flagellum.html
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