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September 18, 2013 Endosymbiosis and Evidence for Endosymbiosis September 18, 2013 Water Potential Problems September 18, 2013 The value for in root tissue is -3.3 bars. If you take the root tissue and place it in a 0.1 M solution of sodium chloride at 20oC in an open beaker, what is the of the solution, and in what direction would the net flow of water be? September 18, 2013 At 18oC, a cell with a P of 3 bars is in equilibrium with the surrounding 0.4M solution of sucrose in an open beaker. What is the S of sucrose in the cell? September 18, 2013 September 18, 2013 Transporting Across the Membrane September 18, 2013 Cystic Fibrosis • Example of a disorder caused by a mutation in a gene that codes for the cell membrane. • CFTR (protein channel) sheets line sweat glands, airways, sinuses, ducts in the digestion and reproduction system. • Allows mucus to slide freely on these linings • Mutation= no hypertonic condition is established on the exterior of the cell and water does not flow outward September 18, 2013 • Film doesn't form and the mucus becomes thick and dried out. • Lungs: Bacteria gets trapped in mucus because of biofilms that form. These microbial populations resist the body's defenses and antibiotics. This leads to a thick mucus layer in the lungs with a buildup of bacteria and foreign particles. September 18, 2013 • CF develops when one has two copies of the mutant gene from each parent. • CTFR is a type of membrane protein. • Loss of a single amino acid during protein synthesis is the cause of CF. • CTFR protein is supposed to be modified and shipped, but mutation and the change in protein shape causes the protein to stop working. September 18, 2013 • "Breathe Life" Video