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Introduction to Biology BELLWORK

Introduction to Biology BELLWORK. Answer the following questions (answers only): Name the organelle that supports the cell and provides shape? Name the organelle that synthesizes (makes) proteins? Name the powerhouse of the cell? Where are old cell organelles broken down and digested?

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Introduction to Biology BELLWORK

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  1. Introduction to BiologyBELLWORK Answer the following questions (answers only): Name the organelle that supports the cell and provides shape? Name the organelle that synthesizes (makes) proteins? Name the powerhouse of the cell? Where are old cell organelles broken down and digested? Which organelle controls entry in and out of the cell?

  2. CHAMPS C- Conversation- NO H- Help- Raise your hand A- Activity- We are taking notes M- No movement P- Sit quietly, eyes on paper, teacher or board. Writing S- Signal

  3. Cell Transport The Cell Membrane: Molecules move in and out of the cell via Active & Passive Transport.

  4. The Cell Membrane • Gatekeeper • Regulates what comes in and out of the cell • Main components: proteins and phospholipids

  5. Cell Wall • Found only in plant cells and bacteria cells • Main function is support

  6. Solutions • Mixtures of substances • Ex. Salt + water; sugar + water

  7. Solvent vs. Solute

  8. Concentration Gradient

  9. Diffusion • The movement of molecules from an area of high concentration to an area of low concentration • Molecules tend to “spread out” • Requires no energy

  10. Equilibrium • When molecules are evenly spread throughout a space Movie starring Christian Bale called “Equilibrium”

  11. Osmosis • The diffusion of water across a membrane • The cell membrane is selectively permeable • Watch the animation

  12. Rule for Osmosis If the area outside the cell has more salt – then water will be sucked out of the cell

  13. U - Tubes

  14. Cells In Different Solutions "ISO" means the same

  15. Hypo = less Cell may burst, or organelles called “contractile vacuoles” remove excess water

  16. Hyper = more Cell will shrink or die, plants wilt Why is it dangerous to drink sea water? Why does pouring salt on a slug kill it?

  17. Passive Transport • Requires no energy • Diffusion & Osmosis • Facilitated Diffusion – carrier proteins “help” molecules across the membrane

  18. 1.  Why is the water moving toward the left side of the beaker?  2.  Which side of the beaker is hypertonic? 3.  What is the solute?  

  19. ACTIVE TRANSPORT • Requires the cell to use energy • Proteins or Pumps found in the membrane move materials across

  20. Endocytosis • Taking “in” large molecules by the cell • Phagocytosis = “phood”, taking in food particles • Pinocytosis = liquid substances

  21. EXOCYTOSIS • Removing large particles (waste) from the cell • Stuff “exits” the cell • Watch video at http://www.esnips.com/doc/2dad912f-9dcc-4936-89d9-1ae32c6125d2/Chapter-6---Endocytosis-and-Exocytosis • Or McGraw Hill Site

  22. Be sure to know the following terms for the test! • Diffusion • Osmosis • Selectively permeable • Equilibrium • Solution • Facilitated Diffusion • Hypertonic • Hypotonic • Isotonic • Passive Transport

  23. Active Transport • Endocytosis • Phagocytosis • Pinocytosis • Exocytosis

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