Multiple Choice
Which of the following processes includes all of the others?
6. The Membrane
Simple and Facilitated Diffusion
Back6. The Membrane
Simple and Facilitated Diffusion
- Multiple Choice
The difference between simple and facilitated diffusion is that facilitated diffusion:
- Multiple Choice
Which of the following does not accurately describe a channel or a carrier?
- Multiple Choice
Which type(s) of molecules cannot enter/exit the cell via simple diffusion and require facilitated diffusion?
- Multiple ChoiceWhich of the following molecules is most likely to passively diffuse across the plasma membrane?
- Multiple ChoiceWhich of the following would be least likely to diffuse through a plasma membrane without the help of a transport protein?
- Multiple ChoiceWhich of the following statements about diffusion is true?
- Multiple ChoiceCells A and B are the same size, shape, and temperature, but cell A is metabolically less active than cell B, and cell B is actively converting oxygen to water in cellular respiration. Oxygen will diffuse more rapidly into cell __________ because __________.
- Multiple ChoiceWhich of these statements describes some aspect of facilitated diffusion?
- Multiple ChoiceWhich of the following is false in regard to facilitated diffusion?
- Open QuestionBased on Figure 7.18, which of these experimental treatments would increase the rate of sucrose transport into a plant cell?a. decreasing extracellular sucrose concentrationb. decreasing extracellular pHc. decreasing cytoplasmic pHd. adding a substance that makes the membrane more permeable to hydrogen ions
- Open QuestionDraw and label the plasma membrane of a cell that is placed in a solution with concentrations of calcium ions and lactose that are greater than those on the inside of the cell. Use arrows to show the relevant gradients and the activity of the following membrane proteins: (1) a pump that exports protons; (2) a calcium channel; and (3) a lactose carrier.
- Open QuestionIn terms of structure, how do channel proteins differ from carrier proteins?
- Open QuestionFacilitated diffusion across a membrane requires ______________ and moves a solute ______________ its concentration gradient.a. transport proteins . . . up (against)b. transport proteins . . . downc. energy and transport proteins . . . upd. energy and transport proteins . . . down
- Open QuestionCells lining kidney tubules function in the reabsorption of water from urine. In response to chemical signals, they reversibly insert additional aquaporins into their plasma membranes. In which of these situations would your tubule cells have the most aquaporins: after a long run on a hot day, right after a large meal, or after drinking a large bottle of water? Explain.