UW-Madison BIOLOGY 101 - Simple diffusion, Facilitated Diffusion, osmosis (2 pages)
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Simple diffusion, Facilitated Diffusion, osmosis
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- Lecture number:
- 5
- Pages:
- 2
- Type:
- Lecture Note
- School:
- University of Wisconsin, Madison
- Course:
- Biology 101 - Zoology 101: Animal Biology
- Edition:
- 1
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Unformatted text preview:
Zoology 101 Animal Biology Last Lecture Outline 1 Cholesterol LDL HDL 2 Fats and Oils Triglycerides 3 Phospholipids Membrane remodeling 4 What do membrane proteins do Lecture 5 Current Outline 1 Simple Diffusion 2 Facilitated diffusion Channel Proteins Carrier proteins 3 Osmosis 4 Active Transport 5 Vesicular Bulk Transport Simple Diffusion Def movement down the concentration gradient No energy needed ex cup of tea Moves from high concentration to low moves to become in most stable state Membrane accepts small uncharged hydrophobic molecules estrogen Gases and water take part in simple diffusion doesn t accept large polar molecules or ions Facilitated Diffusion Also movement down the concentration gradient No energy required movement aided by transmembrane proteins Channel Proteins pore forming transmembrane proteins straw through membrane gated open close in response to specific signals signal molecule binds to channel and opens chamber is hydrophobic selective rapid response Carrier Proteins change shape upon binding to a substance they transport in one side out the other specific shape Major example process of low blood sugar Osmosis Passive transport of water water moves down its concentration gradient no energy proteins are and aren t used Hypertonic lots of solute makes the cell shrivel up and die because water is trying to equilibration its surroundings water goes out of the cell Isotonic surroundings are at an equal amount water in and water out Hypotonic the there is a high concentration outside the cell water moves into the cell causing cell to burst is a combination of both simple diffusion and facilitated diffusion aquaporins water channels frog egg experiment Active Transport movement against the gradient energy is required ATP adenosine triphosphate energy comes from the phosphate bonds proteins are required Types of protein Pumps something active happening sodium potassium pump binds phosphate from ATP changes shape pushes Na out to fit the shape of K
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BIOLOGY 101: Final Exam
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