Membrane Structure and Function

5 Written Questions

1. A transport protein that generates voltage across a membrane
2. The control of water concentrations
3. The movement of specific molecules into a cell by the inward budding of membranous vesicles containing proteins with receptor sites specific to the molecules being taken in; enables a cell to acquire bulk quantities of specific substances.
4. An electrogenic pump found in plants, fungi, and bacteria that actively transports hydrogen ions out of the cell
5. The diffusion of water across a selectively permeable membrane

5 Matching Questions

1. Ion Channels
2. Flaccid
3. Peripheral Proteins
4. Hypertonic
5. Ligand

1. a Membranous proteins not bound in the lipid bilayer, but instead are appendages loosely bound to the surface of the membrane, and often to exposed parts of integral proteins.
2. b Possessing a greater concentration of solvent
3. c A molecule that binds specifically to a receptor site of another molecule.
4. d A transmembrane protein channel that allows a specific ion to flow across the membrane down its concentration gradient
5. e The state of a cell lacking water; is limp

5 Multiple Choice Questions

1. Possessing a lesser concentration of solvent
   1. Isotonic
   2. Hypotonic
   3. Hypertonic
   4. Exocytosis
2. The coupling of the "downhill" diffusion of one substance to the "uphill" transport of another against its own concentration gradient.
   1. Passive Transport
   2. Cotransport
   3. Proton Pump
   4. Active Transport
3. The diffusion gradient of an ion, representing a type of potential energy that accounts for both the concentration difference of the ion across a membrane and its tendency to move relative to the membrane potential.
   1. Concentration Gradient
   2. Electrochemical Gradient
   3. Electrogenic Pump
   4. Peripheral Proteins
4. A type of endocytosis in which the cell ingests extracellular fluid and its dissolved solutes.
   1. Exocytosis
   2. Isotonic
   3. Endocytosis
   4. Pinocytosis
5. A model of the cellular membrane in which the membrane is a fluid structure with a 'mosaic' of various proteins embedded in or attached to a double layer (bilayer) of phospholipids
   1. Gated Channel
   2. Fluid Mosaic Model
   3. Electrogenic Pump
   4. Flaccid

5 True/False Questions

1. Active Transport → The diffusion of a substance across a biological membrane

   True        False

2. Plasmolysis → The diffusion of water across a selectively permeable membrane

   True        False

3. Amphipathic → Possessing a lesser concentration of solvent

   True        False

4. Integral Proteins → Membranous proteins not bound in the lipid bilayer, but instead are appendages loosely bound to the surface of the membrane, and often to exposed parts of integral proteins.

   True        False

5. Transport Proteins → Proteins spanning the cell membrane that allow passage for specific substances

   True        False