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Bell Work 9/28 Write the question with your answer

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Presentation on theme: "Bell Work 9/28 Write the question with your answer"— Presentation transcript:

1 Bell Work 9/28 Write the question with your answer
The cell membrane is mainly composed of _____________. There are also ____________ in the cell membrane which are used for cell signaling There are also __________ in the cell membrane which are used to transport large molecules

2 Bell Work: Egg Lab We soaked eggs in vinegar for 3 days! In your lab sheet write your prediction and hypothesis on what you think happened

3 Now place your egg in your cup and cover it with syrup Write your prediction and hypothesis on what you think will happen

4 CONCENTRATION: the amount of solute (stuff) dissolved into a solvent (liquid)
KOOL-AID is the solute WATER is the solvent CONCENTRATION is how much Kool-Aid you put in

5 DIFFUSION: particles move from an area of HIGH concentration to an area of LOW concentration

6 Kool-Aid Beaker 1 Beaker 2 Beaker 3

7 In a solution, particles are constantly moving
In a solution, particles are constantly moving. They collide with one another and tend to spread out randomly.

8 CONCENTRATION GRADIENT: a difference between two concentrations
If diffusion is going from high concentration to low concentration, what direction is it moving on the concentration gradient? High Concentration Low Concentration

9 EQUILIBRIUM: the concentration of a solute is the same throughout a system
the goal of diffusion!

10 Diffusion does NOT require energy!!

11 Concentration Gradient
Diffusion High No Energy Concentration Gradient Low

12 PERMEABLE membranes allow all substances to pass through
IMPERMEABLE membranes allow no substances to pass through

13 Biological (cell) membranes are SELECTIVELY permeable
Some substances can pass through, while others cannot

14

15 Diffuse: when molecules move from high to low concentration or with the concentration gradient

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