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AP Biology Chapter 7: Cell Membrane Structure. Fig: 7.7.

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Presentation on theme: "AP Biology Chapter 7: Cell Membrane Structure. Fig: 7.7."— Presentation transcript:

1 AP Biology Chapter 7: Cell Membrane Structure

2 Fig: 7.7

3 LE 7-2 Hydrophilic head Hydrophobic tail WATER

4 LE 7-3 Hydrophilic region of protein Hydrophobic region of protein Phospholipid bilayer

5 Proteins of the Membrane

6 Fig: 7.7

7 LE 7-9a Enzymes Signal Receptor ATP Transport Enzymatic activity Signal transduction

8 LE 7-9b Glyco- protein Cell-cell recognition Intercellular joining Attachment to the cytoskeleton and extra- cellular matrix (ECM)

9 Cholesterol of the Membrane

10 LE 7-5a Lateral movement (~10 7 times per second) Flip-flop (~ once per month) Movement of phospholipids

11 LE 7-4 Knife Cytoplasmic layer Extracellular layer Cytoplasmic layer Plasma membrane Extracellular layer Proteins

12 Cell – to – Cell Recognition

13 LE 7-15a EXTRACELLULAR FLUID Channel protein Solute CYTOPLASM

14 LE 7-15b Carrier protein Solute

15 Diffusion

16 Osmosis

17 LE 7-13 Animal cell Lysed H2OH2O H2OH2O H2OH2O Normal Hypotonic solution Isotonic solutionHypertonic solution H2OH2O Shriveled H2OH2O H2OH2O H2OH2O H2OH2O Plant cell Turgid (normal) FlaccidPlasmolyzed

18 Water Potential

19 LE 7-15a EXTRACELLULAR FLUID Channel protein Solute CYTOPLASM

20 LE 7-16 Cytoplasmic Na + bonds to the sodium-potassium pump CYTOPLASM Na + [Na + ] low [K + ] high Na + EXTRACELLULAR FLUID [Na + ] high [K + ] low Na + ATP ADP P Na + binding stimulates phosphorylation by ATP. Na + K+K+ Phosphorylation causes the protein to change its conformation, expelling Na + to the outside. P Extracellular K + binds to the protein, triggering release of the phosphate group. P P Loss of the phosphate restores the proteins original conformation. K + is released and Na + sites are receptive again; the cycle repeats. K+K+ K+K+ K+K+ K+K+ K+K+

21 LE 7-17 Diffusion Facilitated diffusion Passive transport ATP Active transport

22 Cell Voltage Gradient

23 Fig: 7.18

24 Fig: 7.19

25 Phagocytosis & Pinocytosis

26 LE 7-20c Receptor RECEPTOR-MEDIATED ENDOCYTOSIS Ligand Coated pit Coated vesicle Coat protein Coat protein Plasma membrane 0.25 µm A coated pit and a coated vesicle formed during receptor- mediated endocytosis (TEMs).


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