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Agenda

Agenda. Have HW out for stamping Current Event Go over HW Osmosis/Diffusion End/HW: Osmosis/Diffusion Wksht Quiz Monday Mini-Test Wednesday. 1. 2. Grease is hydrophobic. H O H. H O H. H O H. H O H. 3. 4. 5. Small Non-polar > Small polar > Large polar > ion. 6/7.

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Agenda

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  1. Agenda • Have HW out for stamping • Current Event • Go over HW • Osmosis/Diffusion • End/HW: Osmosis/Diffusion Wksht • Quiz Monday Mini-Test Wednesday

  2. 1.

  3. 2 • Grease is hydrophobic H O H H O H H O H H O H

  4. 3.

  5. 4.

  6. 5. • Small Non-polar > Small polar > Large polar > ion

  7. 6/7 • Proteins: • Transport, reception, anchors, enzymes, etc. • Carbs: • Tags/markers/identification

  8. 8. • Specialization. Each organelle/cell is unique in what it contains and highly specialized

  9. 9. • Lysosome – holds in digestive enzymes, protein channels for taking in things to digest • Mitochondria – ATP synthase, channels for NAD+, ADP, Glucose/Pyruvate etc. • Chloroplast – Chlorophyll, ATP synthase, NADP+, ADP, etc. • Nucleus – lets few things in except for some messengers, lets RNA out • White blood cell – proteins and carbs for recognizing foreign cells

  10. 10. Walls Membranes Phospholipids Filters • Carbs (cellulose etc.) • Structures

  11. Osmosis, Diffusion, Active Transport and Bulk Transport CELL TRANSPORT

  12. Diffusion • Things spread out • Move from more concentrated to less concentrated

  13. Passive Transport • Things diffuse across the membrane • If they are able to cross

  14. Facilitated Diffusion • Transport proteins allow polar molecules and ions to travel down concentration gradient • No usage of energy! • Aquaporins – special protein channels for water Peter Agre won the 2003 Nobel Prize for the discovery of aquaporins!

  15. Active Transport • Some transport proteins pump molecules against their concentration gradient • Requires energy (ATP)

  16. Sodium Potassium Pump

  17. Bulk Transport • Many molecules are too large to pass through the membrane • i.e. proteins • They enter the cell through endocytosis and exocytosis

  18. Endocytosis • The cell intakes large molecules by forming new vesicles • Small area of membrane sinks inward, forming a pocket which eventually pinches off

  19. Exocytosis • Vesicle fuses with plasma membrane, expelling contents from the cell • Vesicle membrane becomes part of plasma membrane

  20. Osmosis • Special case of water diffusing • Wherever a solution is less concentrated with solutes, it is more concentrated with water

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