water potential pract Flashcards
(4 cards)
what is a callibration curve and how is it used in biology
A calibration curve is a graph that allows you to determine the unknown concentration of a sample by comparing it with known concentrations. It is created using a dilution series and can be used to estimate unknown values such as water potential in biological samples.
what is water potential?
- Water potential is the tendency of water to move from one area to another. Water moves from areas of high water potential to areas of low water potential by osmosis. It is influenced by solute concentration—more solutes lower the water potential.
How does solute concentration affect the movement of water across a cell membrane?
-Water moves by osmosis from a solution with higher water potential (lower solute concentration) to one with lower water potential (higher solute concentration), affecting cell mass.
What is the method for investigating the effect of sucrose concentration on potato mass?
Make a series of sucrose dilutions (0.0 to 1.0M), place 5cm³ of each in a test tube. Prepare identically sized potato chips, weigh them, place one chip in each tube for 20 minutes, remove, blot dry, and reweigh. Then calculate percentage change in mass.
