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13 Cards in this Set
- Front
- Back
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In cell membranes _____ proteins are embedded at the periphery; _____ proteins span from one side of the membrane to the other side.
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Peripheral
Integral |
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What do peripheral proteins in the cell membrane usually not do?
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Flip from the outer to the inner membrane or vice versa
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What are the lipids that reside within the cell membrane?
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Phospholipids, steroids, glycolipids
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What are the function of the proteins of the cell membrane?
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Transporters
Enzymes Receptors Mediators |
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Membranes are _____ structures that are only a few molecules thick.
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Sheetlike (60-100A thick)
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Membranes are held together by many _____ interactions.
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Non-covalent
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Membranes are asymmetric, what does this mean?
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They have a different amount of certain molecules on the outside vs. the inside.
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Where are the polar regions of a lipid bilayer?
Where are the non-polar regions? |
Surfaces - interact with water
Interior - Hydrophobic lipdis |
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Bilayers arise through the operation of what teo opposing forces?
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Attractive van der Waals forces forces chains togehter
Polar head groups repel each other |
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Because the cell membrane is highly impermeable what can readily diffuse across it?
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Small nonpolar molecules (O2 CO2)
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How do large molecules move across the cell membrane?
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Active transport (us. for proteins)
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_____ molecules are transported across cell membranes by simple diffusion.
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Hydrophobic
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_____ molecules require a carrier protein to cross the cell membrane.
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Hydrophilic
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