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Unformatted text preview: How to calculate Surface Area? Surface area How to calculate Volume? Volume Surface area to Volume Ratio Cell 1 Cell 2 B) Conclusion: Compare the ratios and explain why one cell would be more efficient than another. C) Are you made of lots of large cells or lots of small cells? Why? How do you actually grow in height? 2) Water potential in potato cells was determined in the following manner. The initial masses of six groups of potato cores were measured. The potato cores were placed in sucrose solutions of various molarities. The masses of the cores were measured again after 24 hours. Percent changes in mass were calculated. The results are shown below. Graph the data to the right of the table. On your graph, label the tonicity of the solution and the cell. Determine the apparent molar concentration (osmolarity) of the potato core cells. Molarity of Sucrose in Beaker Percent Change in Mass 0.0 M 18.0 0.2 5.0 0.4 8.0 0.6 16.0 0.8 23.5 1.0 24.0 Looking at the water potential equation, When Solute potential goes down (gets more negative), water potential ____________________ When Pressure potential goes down (gets smaller), water potential ____________________ When would the pressure in a cell rise? (Under what conditions?) Why can only walled cells such as bacteria, fungi and plant cells generate turgor pressure, whereas animal cells cannot? What would happen to the solute potential when the molar concentration of the solute is increased (justify with equation)? WHY? What would happen to the solute potential when Temperature is increased (justify with equation)? WHY? What would happen to the solute potential when the dissolved substance is glucose vs. NaCl (justify with equation)? WHY? Why is water potential important for plants? Predict what would happen to plant and animal cells placed in 0.0M and 4.0M concentration solutions. Free Energy Review Δ G = Δ H  T Δ S What is Entropy? = a measurement of ______________________________ When Δ S is positive this means there is __________________________ When Δ S is negative this means there is __________________________ What is Δ H? = a measurement of __________________________ What is Gibbs Free energy? = a measurement of ___________________________ When Δ G is positive this means _________________________ When Δ G is negative this means _________________________ Δ G (Joules) Δ H (Joules) T (Kelvin) Δ S (J/K) 1000 300 5 1100 300 5 1200 300 5 1300 300 5 1400 300 5 1500 300 5 1600 300 5 1700 300 5 1800 300 5 1900 300 5 What happens to Δ G when Δ H goes up ? WHY? What happens to Δ G when Δ H goes down ? WHY? Δ G Δ H T Δ S 1700 300 5 1700 310 5 1700 320 5 1700 330 5 1700 340 5 1700 350 5 1700 360 5 1700 370 5 1700 380 5 1700 390 5 What happens to Δ G when T goes up ? WHY?...
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 Fall '11
 Boyle
 Biology, Demography, Standard Deviation, Population Ecology, Zygosity

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