cell membrane structure samue presentation.pptx

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1. Cell Membrane Structure and Function

2. Membrane Design 2 fluid-mosaic model a. Fluid = pliable/easily moved b. Mosaic = made of many different molecules (lipids, proteins, carbohydrates) Cell Membrane Animation

3. 3 Predict the two reasons things can’t directly go through the membrane: Selectively Permeable Size (duh) Polarity (from last unit)

4. 4 The cell membrane only lets certain substances in and out of the cell Selectively Permeable

5. Phosopholipid Bi-Layer 5 -polar heads are hydrophilic “water loving” -tails (fatty acids) are hydrophobic “water fearing” and face inward

6. Cholesterol Type of steroid (lipid) Changes fluidity of cell membrane Higher temps – stiffens membrane Lower temps – prevents membrane from freezing

7. Proteins 7 Recognition Proteins Proteins that have carbohydrate chains attached Carbohydrate chains aid in cell identification “Name Tags” Example: Red Blood Cells (A, B), Identify Viruses as foreign Receptor Proteins Proteins that receive chemical signals from other cells Such as nervous system cells

8. Channel Proteins Proteins that involved in letting certain substances in and out of cells Aquaporins- let water in and out of cells Proteins

9. 9 Integral Proteins that cross both layers of the phosphoplipid bilayer Peripheral proteins that are only on the top half or bottom half of the phospholipid bilayer Proteins