More Related Content Similar to cell membrane structure.ppt (20) More from MohamedYasserAliMahm (6) cell membrane structure.ppt2. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Membrane Design
2
fluid-mosaic model
a. Fluid = pliable/easily moved
b. Mosaic = made of many different
molecules (lipids, proteins, carbohydrates)
Cell Membrane Animation
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3
Predict the two reasons things can’t directly go through
the membrane:
Selectively Permeable
1) Size (duh)
2) Polarity (from last unit)
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4
The cell membrane only lets certain substances in and
out of the cell
Selectively Permeable
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Phosopholipid Bi-Layer
5
-polar heads are hydrophilic “water loving”
-tails (fatty acids) are hydrophobic “water fearing” and face inward
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Cholesterol
Type of steroid (lipid)
Changes fluidity of cell membrane
Higher temps – stiffens membrane
Lower temps – prevents membrane from freezing
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Proteins
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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
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Channel Proteins
Proteins that involved in letting certain substances in and out
of cells
Aquaporins- let water in and out of cells
Proteins
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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