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22 Cards in this Set

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