BIOL 1107 Study Guide - Quiz Guide: Fumaric Acid, Succinic Acid, Lyme Disease
Document Summary
Osmosis- diffusion of water across a semipermeable cell membrane. Both passive processes, not dependent on cellular energy. Active transport-moves substances against their concentration gradient and require cell to expend metabolic energy. Energy in form of atp comes from cellular respiration-mitochondria. Carrier molecule-membrane protein binds to and releases the substance being transported. Starch turns blue-black in presence of i2ki reagent. Membrane is impermeable to starch because solution did not turn blue-black. Membrane is permeable to iodine because starch turned blue-black: benedict"s test for glucose. Test cytosol-positive control because you know there is starch(glucose) present. Test water in beaker b to see if membrane is permeable to glucose. Benedict"s test-colorimetric test for presence of reducing sugars. Samples need to be heated by boiling water. If reducing sugar present, it will react with copper sulfate in reagent and reduced copper will precipitate out of solution. Positive reaction-solution will appear green, orange or red depending on amount of reduced copper, reducing sugar present.
