Membrane Structure and Function
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Tails- | made of fatty acids, hydrophobic
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| Heads- | hydrophilic
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| Membrane contains- | proteins and enzymes
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| Cooler temperature means- | membrane is less fluid
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| Warmer temperature means- | membrane is more fluid
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| Proteins function- | transport and receive information and signals
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| Saturated fatty tails mean- | less fluid, thicker
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| Unsaturated fatty tails mean- | more fluid, thinner
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| Effect of cholesterol- | reduces fluidity at moderate temperature, prevents solidification at low temperatures
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| Diffusion- | molecules cross membrane moving from high to low
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| Passive transport: | simple diffusion and facilitated diffusion
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| Simple diffusion- | moves from high to low, no energy needed, no protein helper
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| Facilitated diffusion- | moves from high to low, no energy needed, has a protein helper
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| Active transport- | moves from low to high, ATP required, protein helper, pumps protons into lysosome
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| Bulk transportation- | moves from low to high, needs energy, endocytic or exocytic vesicle helps with entrance or exit from cell
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| Hypertonic- | Concentration of solute is higher outside the cell
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| Hypotonic- | concentration of solute is higher inside the cell
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| Isotonic- | concentration of solute is the same on both sides
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| Q: what kinds of molecules can pass through membrane? | small, non-charges, non-polar molecules
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| Q: can water pass through membrane? | yes, water is small enough to pass through aquapain or membrane with a protein helper, plays a role in osmosis
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| Osmosis- | the passive movement of water from areas with low to high concentrations of solute
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| Carrier protein- | change shape, help facilitate diffusion across membrane
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| Channel protein- | maintains shape, helps facilitate diffusion across membrane
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Created by:
mr_spangler
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