Test Your Knowledge ofTerms and I

1. The movement of water across a plasma membrane occurs by a active transport.

b. facilitated diffusion.

c. simple diffusion (osmosis).

2. Which of these statements about the facilitated diffusion of glucose is true? a There is a net movement from the region of lower to the region of higher concentration.

b. Carrier proteins in the cell membrane are required for this transport.

c. This transport requires energy obtained from ATP.

d. It is an example of cotransport.

3. If a poison such as cyanide stopped the production of ATP, which of the following transport processes would cease?

a. the movement of Na+ out of a cell b. osmosis c. the movement of K+ out of a cell d. all of these

4. Red blood cells crenate in a. a hypotonic solution.

b. an isotonic solution.

c. a hypertonic solution.

5. Plasma has an osmolality of about 300 mOsm. The osmolality of isotonic saline is equal to a. 150 mOsm.

d. none of these.

6. Which of these statements comparing a 0.5 m NaCl solution and a 1.0 m glucose solution is true?

a. They have the same osmolality.

b. They have the same osmotic pressure.

c. They are isotonic to each other.

d. All of these are true.

7. The most important diffusible ion in the establishment of the membrane potential is a K-.

8. Which of these statements regarding an increase in blood osmolality is true? a It can occur as a result of dehydration.

b. It causes a decrease in blood osmotic pressure.

c. It is accompanied by a decrease in ADH secretion.

d. All of these are true.

9. In hyperkalemia, the resting membrane potential a. moves farther from 0 millivolts.

b. moves closer to 0 millivolts.

c. remains unaffected.

10. Which of these statements about the

a. Na+ is actively transported into the cell.

b. K- is actively transported out of the cell.

c. An equal number of Na+ and K+ ions are transported with each cycle of the pump.

d. The pumps are constantly active in all cells.

11. Which of these statements about carrier-

mediated facilitated diffusion is true?

a. It uses cellular ATP.

b. It is used for cellular uptake of blood glucose.

Chapter Six c. It is a form of active transport.

d. None of these are true.

12. Which of these is not an example of cotransport?

a. movement of glucose and Na+ through the apical epithelial membrane in the intestinal epithelium b. movement of Na+ and K+ through the action of the Na+/K+ pumps c. movement of Na+ and glucose across the kidney tubules d. movement of Na+ into a cell while Ca2+ moves out

Describe the conditions required to produce osmosis and explain why osmosis occurs under these conditions.1

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Responses

  • Felix
    Which of these statements about simple diffusion and active transport is true?
    8 years ago
  • Pandora
    Which of these statements about the facilitated diffusion of glucose is true?
    8 years ago
  • Anna
    Which of these statements regarding an increase in blood osmolality is true?
    8 years ago
  • jo
    Which of these statement about the facilitated diffusion of glucose is true?
    8 years ago
  • corey
    Why osmosis occurs under these conditions?
    8 years ago
  • erik delgado
    What is the most important diffusible ion in the establishment of the membrane potential?
    8 years ago
  • kristian
    Which of these statements about osmosis is true?
    8 years ago

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