Bio 1 Week 4 Notes
Bio 1 Week 4 Notes BSC2010
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This 1 page Class Notes was uploaded by clb13m on Sunday January 31, 2016. The Class Notes belongs to BSC2010 at Florida State University taught by Dr. Steven Marks in Fall 2015. Since its upload, it has received 8 views. For similar materials see Biological Science 1 in Biological Sciences at Florida State University.
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Date Created: 01/31/16
Understand the difference between simple diffusion and facilitated diffusion. Know that except for gasses, like O2, N2, and CO2, nearly all substances that diffuse across cell membranes move by facilitated diffusion through channels or carriers. o Simple diffusion – movement of molecules from regions of high concentration to regions of low concentration o Facilitated diffusion – use of channels and carrier proteins. Channels provide a pore for movement of substances. Carrier proteins flipflop substances across membrane. Both proteins are highly specific and are regulated o Except for gases like O2, N2, and CO2, nearly all substances that diffuse across cell membranes move by facilitated diffusion through channels or carriers. Channels and carriers are highly specific for the molecules or ions they transport and they are regulated. o Water moves through the channel aquaporin. Be able to make predictions about the direction that solutes or water will moveif given the concentrations of solutes across a membrane. Be able to correctly use the terms hypotonic, isotonic and hypertonic. o Hypotonic – solute concentration outside cell is less than that inside of the cell; cell gains water; in animal cell its lysed (Bursts); in plant cell its turgid (best state) o Isotonic – solute concentration is same as that inside cell; no net water movement across plasma membrane; in animal cell its normal; in plant cell its flaccid (thirsty) o Hypertonic – solute concentration is greater than that inside the cell; cell loses water; in animal cell its shriveled; in plant cell its plasmolyzed (real thirsty) Understand that active transport is transport of a substance against its chemical (or electrochemical) gradient and that active transport requires the input of energy (usually in the form of ATP). Proteins that actively transport ions are often called ion pumps). Know that the Na/K pump is the main ion pump in animal cell membranes, that it pumps 3 NA+ out and 2 K+ in. Understand that the active pumping of ions creates both a chemical gradient of the pumped ion and an inside negative membrane voltage (membrane potential). Understand that the electrochemical gradient of the pumped ion can be coupled to the movement of other substances by means of cotransport o Cotransport – uptake of sugars, amino acids, or ions, is coupled to uptake of the pumped ion Know what endocytosis and exocytosis are. o Exocytosis – used to transport materials out of the cell o Endocytosis – used to transport materials into the cell 3 types: phagocytosis (larger molecules; eats) pinocytosis (small molecules; drinks) receptormediated endocytosis (vesicle is coated by receptors and only has receptors and corresponding ligands in vesicle
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