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23 Cards in this Set

  • Front
  • Back
Membranes are made of a _____ _____.
Phospholipid Bilayer
Increasing the amount of cholesterol in a membrane would do what to its fluidity?
Decrease it
In reference to polarity, the head of a phospholipid is ____ and the tails are ____.
Polar, Nonpolar
List the four components of the cell membrane.
Phospholipid Bilayer, Transmembrane Proteins, Interior Protein Network(Cytoskeleton), and Cell Surface Markers (Glycocalyx)
What are some of the functions of membrane proteins?
Transporters, Enzymes, Cell Surface Identity Markers, Cell Adhesion Proteins, Attachments to Cytoskeleton
How are proteins held in the membrane?
Modified lipids enter the internal region of the bilayer and chemically bind to the protein.
What is diffusion?
The random motion of particles that cause a net movement of particles from high concentration to low concentration.
What is selective permeability?
The allowance of only certain molecules to pass through protein channels.
The direction of movement of ions through membrane transport proteins depends on _____ and _________________.
Concentration, Voltage Across the Membrane
What are the three characterstics of the carriers of facilitated diffusion?
Specific (only allow certain molecules through), Passive (No ATP used), and Saturatable (Rate of Diffusion Levels off at Increased Concentrations)
What is osmosis?
The diffusion of water down its concentration gradient.
What is osmotic concentration?
The concentration of all solutes in the solution.
What are hyperosmotic, hyposmotic, and isosmotic?
Solute of higher concentration, lower concentration, and equal concentration.
What is hyrdrostatic pressure?
The pressure of the cytoplasm on the cell membrane.
What is osmotic pressure?
The pressure that must be applied to stop the net movement of water across a membrane.
What are some methods of maintaining osmotic balance?
Extrusion (Contractile Vacuole Pushes out Water), Isosmotic Solutions (Internal Solute Concentration Adjusts to Environment), Turgor (High Internal Solute Concentration Brings in Water that Applies Pressure to the Membrane)
What is Endocytosis? What is Exocytosis?
The enveloping of food by a cell membrane, the release of waste by a cell membrane.
In Endocytosis, what is the difference between phagocytosis and pinocytosis?
Phagocytosis Envelopes Solids. Pinocytosis Envelopes Liquids.
What happens in receptor-mediated endocytosis?
Receptors on the plasma membrane recognize specific molecules and then envelope them.
What material coats the pit in the membrane of receptor-mediated endocytosis?
What is active transport?
A method of molecular transport that requires the expenditure of energy to move molecules against their concentration gradient.
What is coupled transport?
The use of energy stored in the concentration gradient of a molecule to actively tranport a different one.
Who made these flashcards?
Robert Fromm