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Cell Boundaries Chapter 7 Section 3
What are boundaries? <ul><li>We have borders surrounding countries </li></ul><ul><li>We have boundaries on a playing field...
What are the borders of a cell? <ul><li>Cell membrane </li></ul><ul><ul><li>Thin, flexible barrier </li></ul></ul><ul><li>...
Cell Membrane <ul><li>What does it do for cell? </li></ul><ul><ul><li>Controls what goes in and out  </li></ul></ul><ul><u...
Cell Membrane <ul><li>Lipid bilayer </li></ul><ul><ul><li>What are lipids? </li></ul></ul><ul><ul><li>What does bi- mean? ...
Other things in the membrane… <ul><li>Proteins embedded in lipid bilayer </li></ul><ul><li>Carbohydrates attached to prote...
 
Proteins <ul><li>Proteins help things get across membrane </li></ul><ul><li>Kinda like a pump </li></ul>
Carbohydrates… <ul><li>Chemical identification cards </li></ul><ul><li>“ ID” card of cell </li></ul><ul><li>Helps individu...
 
Cell Walls <ul><li>Outside cell membrane (does NOT replace membrane!!!) </li></ul><ul><li>Plants, algae, fungi, prokaryote...
 
Cell walls made of… <ul><li>Protein and carbs </li></ul><ul><li>Plant cell walls made up of CELLULOSE </li></ul><ul><ul><l...
<ul><li>A biological membrane </li></ul><ul><li>Cells exist in liquid environments </li></ul><ul><li>Things need to get in...
Concentration (conc.) <ul><ul><li>Solution </li></ul></ul><ul><ul><ul><li>Mix of 2 or more substances </li></ul></ul></ul>...
Diffusion <ul><li>Particles constantly move </li></ul><ul><li>Collide randomly </li></ul><ul><li>Spread out randomly </li>...
 
Equilibrium <ul><li>When the conc. Of a system is the same throughout  </li></ul><ul><li>(same conc. on both sides) </li><...
What’s this have to do with cells? <ul><li>Cell have liquid inside and are found in liquid environment </li></ul><ul><li>W...
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Cell Boundaries Part 1

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donohue biology notes cell boundaries

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Cell Boundaries Part 1

  1. 2. Cell Boundaries Chapter 7 Section 3
  2. 3. What are boundaries? <ul><li>We have borders surrounding countries </li></ul><ul><li>We have boundaries on a playing field </li></ul><ul><li>Why are borders important? </li></ul>
  3. 4. What are the borders of a cell? <ul><li>Cell membrane </li></ul><ul><ul><li>Thin, flexible barrier </li></ul></ul><ul><li>Cell wall </li></ul><ul><ul><li>Plant, algae, fungi, prokaryotes </li></ul></ul><ul><ul><li>Strong supporting layer </li></ul></ul>
  4. 5. Cell Membrane <ul><li>What does it do for cell? </li></ul><ul><ul><li>Controls what goes in and out </li></ul></ul><ul><ul><ul><li>Regulates molecules moving from one liquid side of the cell to the other liquid side of the cell </li></ul></ul></ul><ul><ul><li>Protects </li></ul></ul><ul><ul><li>Supports </li></ul></ul>
  5. 6. Cell Membrane <ul><li>Lipid bilayer </li></ul><ul><ul><li>What are lipids? </li></ul></ul><ul><ul><li>What does bi- mean? </li></ul></ul><ul><ul><li>What’s a layer? </li></ul></ul><ul><li>A cell membrane is made of two </li></ul><ul><li>layers of lipid molecules </li></ul>
  6. 7. Other things in the membrane… <ul><li>Proteins embedded in lipid bilayer </li></ul><ul><li>Carbohydrates attached to proteins </li></ul><ul><li>So many different molecules in membrane, we call it a “mosaic” of different molecules </li></ul>
  7. 9. Proteins <ul><li>Proteins help things get across membrane </li></ul><ul><li>Kinda like a pump </li></ul>
  8. 10. Carbohydrates… <ul><li>Chemical identification cards </li></ul><ul><li>“ ID” card of cell </li></ul><ul><li>Helps individual cells id each other </li></ul>
  9. 12. Cell Walls <ul><li>Outside cell membrane (does NOT replace membrane!!!) </li></ul><ul><li>Plants, algae, fungi, prokaryotes </li></ul><ul><li>Have pores to allow things in </li></ul><ul><li>Function: SUPPORT and PROTECT </li></ul>
  10. 14. Cell walls made of… <ul><li>Protein and carbs </li></ul><ul><li>Plant cell walls made up of CELLULOSE </li></ul><ul><ul><li>This is a tough carbohydrate </li></ul></ul><ul><ul><li>Wood and paper </li></ul></ul>
  11. 15. <ul><li>A biological membrane </li></ul><ul><li>Cells exist in liquid environments </li></ul><ul><li>Things need to get in and out of cell </li></ul><ul><li>Different ways to do this…. </li></ul>The Cell Membrane
  12. 16. Concentration (conc.) <ul><ul><li>Solution </li></ul></ul><ul><ul><ul><li>Mix of 2 or more substances </li></ul></ul></ul><ul><ul><li>Solutes </li></ul></ul><ul><ul><ul><li>Substance dissolved in solution </li></ul></ul></ul><ul><ul><li>Concentration is mass of SOLUTE in a given volume of solution (g/L) </li></ul></ul><ul><ul><li>What is the concentration of 12 grams of salt dissolved in 3 liters of water? </li></ul></ul><ul><ul><ul><li>12g/3L= 4g/L </li></ul></ul></ul>
  13. 17. Diffusion <ul><li>Particles constantly move </li></ul><ul><li>Collide randomly </li></ul><ul><li>Spread out randomly </li></ul><ul><li>Diffusion is moving from area of HIGH conc. to area of LOW conc. </li></ul>
  14. 19. Equilibrium <ul><li>When the conc. Of a system is the same throughout </li></ul><ul><li>(same conc. on both sides) </li></ul>
  15. 20. What’s this have to do with cells? <ul><li>Cell have liquid inside and are found in liquid environment </li></ul><ul><li>We have substances (solutes) inside and outside cell </li></ul><ul><li>Unequal concentrations means we get DIFFUSION!!! </li></ul><ul><li>B/c diffusion depends on random particle movements, substances diffuse across membranes without requiring the cell to use energy </li></ul>

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