BIOL 101 1st Edition Lecture 6 Outline of Last Lecture I. Nucleic AcidII. The Cella. What exists in what type of cell?Outline of Current Lecture Membrane Structure and FunctionI. Compare/Contrast-- Passive Transport: Simple Diffusion (SD), Passive Transport: Facilitated Diffusion (FD), Active Transport (AT)II. Passive Transport: OsmosisIII. Bulk Transport – what are the types? Why the various types? Which way will water move? Current LectureMembrane Structure and FunctionClass DiscussionObjectives- Discriminate between passive transport, active transport, and bulk transport ofmolecules across a membrane.- Predict how water will move via osmosis and explain why this is critical to your cells.Even though water is polar, it is very small and can pass freely through the membraneWhen large amounts of water move quickly across a membrane (kidney), we find transporter proteins called aquaporins. I. Compare/Contrast-- Passive Transport: Simple Diffusion (SD), Passive Transport: Facilitated Diffusion (FD), Active Transport (AT)Follows concentration gradient (high to low)- simple diffusion or facilitated diffusion Requires ATP- active transportThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.Movement of ions against a concentration gradient- active transport Movement of oxygen and carbon dioxide down a concentration gradient- simple diffusionRequires a transport protein- facilitated diffusion and active transportMovement of glucose down a concentration gradient- facilitated diffusion Movement of water down a concentration gradient- facilitated diffusion and simple diffusionIf glucose transporters are missing, then they are going to have trouble making energy. Diabetes is a problem with glucose transport, they cannot get glucose into their cells II. Passive Transport: OsmosisWhich way will water move? Water will move to the left because it wants to equal out the concentration on either side. The left side is hypertonic because it has more solute, the right side is hypotonic because it has less solutes. Water is more concentrated on the right therefore its going to more to the left, its lower concentration gradient I. Bulk Transport – what are the types? Why the various types?Bulk transport – allows for the movement of a lot more or larger molecules through cells. A. A white blood cell engulfs a bacterium: phagocytosisB. Many insulin proteins are exported out of the cell after leaving the Golgi Apparatus:exocytosisC. Transferrin receptors on the outer surface of bone marrow stem cells attach to theprotein transferrin which has iron bound to it. The proteins and the bound iron arebrought into the cell via small vesicles: receptor mediated endocytosisExtracellular fluids and any solutes dissolved within the fluid are brought into the cell in small vesicles:
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