The plasma membrane is referred to as a "fluid mosaic" structure. Which of the following statements about that model is true?
answer
in the interior of the membrane
question
Which of the following functions of membrane proteins is important in tissue formation during embryonic development in animals?
answer
Membrane proteins with short sugar chains form identification tags that are recognized by other cells.
question
Which of the following statements concerning carbohydrates associated with the plasma membrane is correct?
answer
Membrane carbohydrates function primarily in cell-cell recognition.
question
Where in the membrane would carbohydrates most likely be found?
answer
on the outside (external) surface of the membrane
question
Which of the following molecules is most likely to passively diffuse across the plasma membrane?
answer
Carbon Dioxide
question
Which of the following would be LEAST likely to diffuse through a plasma membrane without the help of a transport protein?
answer
Large, polar molecule
question
Cells 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 __________.
answer
B ... the diffusion gradient in cell B is steeper
question
Which of the following statements about diffusion is true?
answer
Its a passive process
question
Seawater is hypertonic to cytoplasm in vertebrate cells and in plant cells. If a red blood cell and a plant cell were placed in seawater, what would happen to the two types of cells?
answer
Both cells would lose water; The red blood cell would shrivel, and the plant plasma membrane would pull away from the cell wall
question
Which of these statements describes some aspect of facilitated diffusion?
answer
Facilitated diffusion of solutes may occur through channel or transport proteins in the membrane
question
Glucose can be moved into cells via an active transport mechanism when the concentration of glucose inside the cell is higher than the concentration of glucose outside of the cell. This active transport mechanism moves glucose and sodium into the cell at the same time. The glucose moves up its gradient and the sodium moves down its gradient. Which of the following statements about this mechanism is accurate?
answer
To pump glucose up its concentration gradient, sodium moves down its concentration gradient, and the distribution of sodium ions across the membrane forms an electrochemical gradient that drives this mechanism.
question
Which of the following is a correct difference between active transport and facilitated diffusion?
answer
Active transport requires energy from ATP, and facilitated diffusion does not.
question
Which of the following statements about the sodium-potassium pump is correct?
answer
The sodium-potassium pump moves Na+ and K+ in opposite directions, resulting in a net negative charge inside the cell.
question
Which of the following correctly describes a general property of all electrogenic pumps?
answer
Electrogenic pumps create a voltage difference across the membrane.
question
Which of the following statements about cotransport of solutes across a membrane is correct?
answer
Cotransport proteins allow a single ATP-powered pump to drive the active transport of many different solutes.
question
Which of the following enables a cell to pick up and concentrate a specific kind of molecule?
answer
receptor-mediated endocytosis
question
Which of the following processes and organelles account for the replacement of lipids and proteins lost from the plasma membrane?
answer
exocytosis and smooth ER and rough ER
question
Which of the following pairs correctly matches a membrane transport process to its primary function?
answer
pinocytosis: the uptake of water and small solutes into the cell by formation of vesicles at the plasma membrane
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