← Chapter 7 Test
5 Written Questions
5 Matching Questions
- electrogenic pump
- a An ion transport protein that generates voltage across a membrane.
- b Having the same solute concentration as another solution.
- c A transport protein in the plasma membrane of a plant or animal cell that specifically facilitates the diffusion of water across the membrane (osmosis).
- d A type of endocytosis in which the cell ingests extracellular fluid and its dissolved solutes.
- e The ability of a solution to cause a cell within it to gain or lose water.
5 Multiple Choice Questions
- In comparing two solutions, referring to the one with a greater solute concentration.
- A protein covalently attached to a carbohydrate.
- A lipid covalently attached to a carbohydrate.
- Protein channel in a cell membrane that allows passage of a specific ion down its concentration gradient.
- 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.
5 True/False Questions
electrochemical gradient → 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.
fluid mosaic model → The currently accepted model of cell membrane structure, which envisions the membrane as a mosaic of individually inserted protein molecules drifting laterally in a fluid bilayer of phospholipids.
selective permeability → A property of biological membranes that allows some substances to cross more easily than others.
proton pump → Having the same solute concentration as another solution.
concentration gradient → An increase or decrease in the density of a chemical substance in an area. Cells often maintain concentration gradients of ions across their membranes. When a gradient exists, the ions or other chemical substances involved tend to move from where they are more concentrated to where they are less concentrated.