Term
| The cell membrane is composed of |
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Definition
a phospholipid bilayer. The phosphate end is hydrophilic,
while the 2 fatty acid (lipid) end is hydrophobic. |
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Term
| Cell membrane proteins – some examples: |
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Definition
1) Receptor proteins: Used in signal transduction. The receptors bind outside molecules which
triggers chemical reactions inside the cell.
2) Cell Adhesion molecules (CAMs): enable specific cell types to stick together
3) Carrier proteins: transport molecules across the membrane
4) Cell surface proteins: Identify the cell as “self” (immune system) |
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Term
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Definition
Diffusion is the movement of a substance from an area of high concentration to a region of low
concentration, until it evens out. |
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Term
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Definition
does not require energy or a carrier molecule. Once the concentration is the
same on both sides of the membrane, the molecules just move back and forth in dynamic
equilibrium. |
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Term
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Definition
| a particular type of diffusion, the movement of water across a biological membrane. |
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Term
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Definition
the solute concentration is the same inside and outside the cell,
usually cells are isotonic to the surrounding fluid, so there is no net flow of water. |
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