Science Notes

Topics: Red blood cell, Protein, Cell membrane Pages: 2 (569 words) Published: April 18, 2013
Cell membrane has proteins (recognize chem sig) floating in lipids and controls active transport, recog of chem mess and protection.Damage to cm can disrupt water balance and a cm cant protect cell from all toxins Simple diffusion co2 and h2o can pass cm is selectively permeable maintain homeostatis In a single celled organism cell membrane acts as a lung and does active transport and diffusion. When protein carb and fat are completely digested they will be soluble enough to pass cm Molec b can pass through active transport because it go low to high The calcium concentration in the root cells of certain plants is higher than in the surrounding soil. Calcium may continue to enter the root cells of the plant by the process of active transport Need atp when moving from low to highA cell will shrink if placed in 15 salt soliution because it goes from high water to low water

co2 would diffuse out of cell cause high to low key word diffuse not glucose into cell because low glucose out side that require atp cuse low to high when relating mmolec x that diffuses and atp u say high to low and no atp used because molec x moves from high to low cause diffusion but atp not used in diffusion In a class, each student made three models of the small intestine using three artificial membrane tubes. They filled each of the three tubes with equal amounts of water, starch, protein, and vitamin C. They added starch-digesting enzyme to tube 1. They added protein-digesting enzyme to tube 2. No enzyme was added to tube 3. The ends of the membrane tubes were sealed and the tubes were soaked for 24 hours in beakers of pure water. The beakers were numbered 1, 2, and 3, corresponding to the number of the tube they contained. At the end of the experiment, the students removed the tubes and tested the water in the beakers for the presence of nutrients.Which statement would be a valid inference if vitamin C had been present in the water in each beaker? Vitamin c is a small...
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