Chapter 3 Test

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Class Topics
Title Biology 11/2/06
Objectives

• To assess learning about cells and their
  organelles and begin learning about movement of
  molecules across the cell membrane

• Chapter 3 Test
• Notes Chapter 4
• "183 nights between 20 March and 20 September
  times 7 hours per night of candle usage equals
  1,281 hours for a half year of candle usage.
  Multiplying by 100,000 families gives 128,100,000
  hours by candlelight. Each candle requires half a
  pound of tallow and wax, thus a total of
  64,050,000 pounds. At a price of thirty sols per
  pounds of tallow and wax (two hundred sols make
  one livre tournois), the total sum comes to
  96,075,000 livre tournois.
• Benjamin Franklin on the purpose of daylight
  savings time

Friday, October 31, 2014 756 AM
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Corrections

• Starting at the beginning of next week there will
  be no more corrections for a two week time
  period.
• Students are abusing the privilege and not taking
  homework seriously.
• Too many DNF and plagiarism
• Good luck!

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Class Assignments
By When
What

• Chapter 3 Test 11/2/06
• All Chapter 3 corrections 11/6/06
• Read 73-80 11/6/06
• W.S. 4.1 (DR/Quiz) 11/6/06
• Due this class period
• Due next class period
• Due in the future

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Grade Sheet
1A SR p. 61 - 5 pts Measurement W.S. 10 pts
3A SR p. 42 6 pts
4A SR p. 47 5 pts
2A Measurement W.S. 10 pts
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Posttest Activities

• Hand in test
• Pick up W.S. 4.1
• Correct homework
• Take advantage of this while you still can!
• Read 73-80

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Passive Transport

• The movement of molecules through a membrane
  without any energy from the cell.
• DIFFUSION
• Molecules will move from areas of high
  concentration to areas of low concentration
• Equilibrium Concentration is equal throughout a
  space.
• End of diffusion

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From http//epswww.unm.edu/coursinf/eps462/page4.
htm
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Diffusion in cells

• Into or out of a cell
• Through lipid bilayer
• This is how water, oxygen, and carbon dioxide
  pass through the cell membrane
• Go with the concentration gradient
• think hill

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Selectively permeable membranes

• Allows small polar or nonpolar particles through
• larger or polar particles do not pass

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Where are the polar and nonpolar areas?
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Osmosis

• The diffusion of water (passive transport)
• 3 types of solutions
• hypotonic
• hypertonic
• isotonic

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Hypotonic

• high concentration of water outside of the cell
• Movement of water into the cell
• Cell swells
• Distilled water
• Pond water for most organisms
• must have contractile vacuole
• Cytolysis bursting of cells

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Hypertonic

• High concentration of water inside the cell
• Water moves out of the cell
• Cell shrinks (plasmolysis)
• Salt water

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Isotonic

• Same concentration inside and outside the cell
• No net movement of water
• no effect on the cell
• Blood plasma
• Why?

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Osmotic Pressure

• Plants, fungus, bacteria
• Turgor pressure (on cell wall)
• Animals
• Blood plasma (isotonic)
• freshwater protists
• Contractile vacuole sump pump