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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? Which organelle controls entry in and out of the cell?
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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
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Cell Transport The Cell Membrane:
Molecules move in and out of the cell via Active & Passive Transport.
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The Cell Membrane Gatekeeper
Regulates what comes in and out of the cell Main components: proteins and phospholipids
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Cell Wall Found only in plant cells and bacteria cells
Main function is support
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Solutions Mixtures of substances Ex. Salt + water; sugar + water
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Solvent vs. Solute
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Concentration Gradient
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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
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Equilibrium When molecules are evenly spread throughout a space
Movie starring Christian Bale called “Equilibrium”
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Osmosis The diffusion of water across a membrane
The cell membrane is selectively permeable Watch the animation
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Rule for Osmosis If the area outside the cell has more salt – then water will be sucked out of the cell
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U - Tubes
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Cells In Different Solutions
"ISO" means the same
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Hypo = less Cell may burst, or organelles called “contractile vacuoles” remove excess water
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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?
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Passive Transport Requires no energy Diffusion & Osmosis
Facilitated Diffusion – carrier proteins “help” molecules across the membrane
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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?
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ACTIVE TRANSPORT Requires the cell to use energy
Proteins or Pumps found in the membrane move materials across
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Endocytosis Taking “in” large molecules by the cell
Phagocytosis = “phood”, taking in food particles Pinocytosis = liquid substances
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EXOCYTOSIS Removing large particles (waste) from the cell
Stuff “exits” the cell Watch video at d9-1ae32c6125d2/Chapter-6--- Endocytosis-and-Exocytosis Or McGraw Hill Site
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Be sure to know the following terms for the test!
Diffusion Osmosis Selectively permeable Equilibrium Solution Facilitated Diffusion Hypertonic Hypotonic Isotonic Passive Transport
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Active Transport Endocytosis Phagocytosis Pinocytosis Exocytosis
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