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22 Cards in this Set
- Front
- Back
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Cell membranes act as
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selective barriers
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______ ______ in the plasma membrane enable the cell to receive signals from the environment
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receptor proteins
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________ _________in the membrane enable the import and export of small molecules
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Transport proteins
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the flexibility of the membrane and its capacity for expansion allow ________ and _________
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cell growth and cell movement
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_______ and _______are each enclosed by two membranes.
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nucleus and mitochondria
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cell membranes are made up of _______ and ________
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lipids and proteins
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A typical membrane lipid molecule has
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a hydrophilic head and hydrophobic tails
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most common type of cell membrane lipid
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phospholipids
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the most common phospholipid in cell membrane
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Phosphatidylcholine
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Each lipid has a hydrophilic head and hydrophobic tail which makes it ________
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amphipathic
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A hydrophilic molecule attracts or repels water molecules?
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attracts water
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a_________ molecule tends to avoid water
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hydrophobic
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what molecules are hydrophobic?
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fat molecules
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_______ are amphipathic?
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phospholipid
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amphipathic phospholipids form a ? in water
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bilayer
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The ____structure is stable because it avoids the exposure of the hydrophobic hydrocarbon tails to water
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closed
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closed structure is energetically _________
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favorable
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the planar lipid bilayer is energetically________
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unfavorable
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Pure phospholipids can form closed, ______ __________
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spherical liposomes
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the types of movement possible for phospholipid molecules in a lipid bilayer are
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later diffusion, flexion, rotation, flip flop (rarely occurs)
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Phospholipids move within one face of a bilayer, but do not _____ _____
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flip flop
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techniques that can be used to measure the rate of lateral diffusion of a membrane protein.
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photobleaching
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