Monday, October 19, 2009
Mon-Day 2
Bio 3/6- the following hw objectives will NOT be due tomorrow:
17. What is the function of a transport protein and how does it perform its
function? Give a specific example of a transport protein performing its
function.
18. What phenomena with respect to diffusion were observed during the NY
State Regents lab on the “onion cell”?
Today, we discussed the two general types of transport of substances into or out of cells: active transport ( e.g. lower to higher concentration NET movement of a substance; also, phagocytosis, pinocytosis, endocytosis, and exocytosis) AND passive transport (e.g. higher to lower concentration NET movement of a substance; diffusion, diffusion-of-water=osmosis, and facilitated diffusion.
We also looked at three examples of osmosis in HYPOtonic (too little solute, HIGHER WATER concentration/percentage) solution, ISOtonic solution, and HYPERtonic (too much solute, LOWER WATER concentration/percentage). We showed that differences in water concentration CAUSED different RATES of water flow into the cell than out of the cell causing the cell to either swell with water (and possible lysis, for animal cells), stay the same, or shrink due to water loss.
The SOLUTE particles/salt ions are NOT generally permeable (CANNOT PASS THROUGH) cell membranes (phospholipids) other than by ACTIVE TRANSPORT through a specialized TRANSPORT PROTEIN; this is why we had to focus ONLY on the net WATER movement.
Tomorrow, we will do a lab showing this type of phenomenon.
AP Chem- we did another Graham's Law problem in which we determined the molar mass of an unknown gas based on its time to diffuse from a balloon. We then derived the formula for average speed of a gas phase molecule at a particular temperature. We had to do unit analysis and tweak the "3" to a "3000" in the formula so that we could still use the NORMAL measurement of molar mass in "grams per mole".
We discussed kinetic molecular theory that explains and predicts the behavior of gases and also can explain how and why gases deviate from ideal behavior.
We then discussed Vanderwaal's modified gas equation that uses experimentally determined correction factors for real gases so that ideal gas law calculations can be accurately applied.
We discussed the meaning of each of the correction factors and their place in the equation.
17. What is the function of a transport protein and how does it perform its
function? Give a specific example of a transport protein performing its
function.
18. What phenomena with respect to diffusion were observed during the NY
State Regents lab on the “onion cell”?
Today, we discussed the two general types of transport of substances into or out of cells: active transport ( e.g. lower to higher concentration NET movement of a substance; also, phagocytosis, pinocytosis, endocytosis, and exocytosis) AND passive transport (e.g. higher to lower concentration NET movement of a substance; diffusion, diffusion-of-water=osmosis, and facilitated diffusion.
We also looked at three examples of osmosis in HYPOtonic (too little solute, HIGHER WATER concentration/percentage) solution, ISOtonic solution, and HYPERtonic (too much solute, LOWER WATER concentration/percentage). We showed that differences in water concentration CAUSED different RATES of water flow into the cell than out of the cell causing the cell to either swell with water (and possible lysis, for animal cells), stay the same, or shrink due to water loss.
The SOLUTE particles/salt ions are NOT generally permeable (CANNOT PASS THROUGH) cell membranes (phospholipids) other than by ACTIVE TRANSPORT through a specialized TRANSPORT PROTEIN; this is why we had to focus ONLY on the net WATER movement.
Tomorrow, we will do a lab showing this type of phenomenon.
AP Chem- we did another Graham's Law problem in which we determined the molar mass of an unknown gas based on its time to diffuse from a balloon. We then derived the formula for average speed of a gas phase molecule at a particular temperature. We had to do unit analysis and tweak the "3" to a "3000" in the formula so that we could still use the NORMAL measurement of molar mass in "grams per mole".
We discussed kinetic molecular theory that explains and predicts the behavior of gases and also can explain how and why gases deviate from ideal behavior.
We then discussed Vanderwaal's modified gas equation that uses experimentally determined correction factors for real gases so that ideal gas law calculations can be accurately applied.
We discussed the meaning of each of the correction factors and their place in the equation.
# posted by C @ 1:43 PM 
