Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
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
|