Lip ore 7. All of the following statements are true regarding active transport e

Question

Lip ore 7. All of the following statements are true regarding active transport except for one Which statement does not apply to active tr ansport? A. Move substances down a concentration gradient B. Moves C. Results in substances from a lower to a higher concentration gradient "hording" of substances D. Requires hydrolysis of ATP E. Requires integral membrane proteins 8. Th e sodium-potassium pump is also known as the sodium-potassium A. ATP channel B. ATPase C. ATP synthase D. channel E. receptor 9. The sodium-potassium pump moves an equal number of sodium and potassium ions across the plasma membrane. A. True B. False 10. The sodium-potassium pump is an example of a(n) A. Antiporter B. Cotransporter C. Uniporter D. Symporter 11. The sodium-potassium pump moves sodium A. Into cells with its concentration gradient B. Into cells against its concentration gradient C. Out of cells with its concentration gradient D. Out of cells against its concentration gradient 12. The sodium-potassium pump moves potassium A. Into cells with its concentration gradient B. Into cells against its concentration gradient C. Out of cells with its concentration gradient D. Out of cells against its concentration gradient 13. What is the ratio of sodium to potassium moved by the sodium-potassium pump? A. 1 sodium to 1 potassium B. 2 sodium to 2 potassium C. 2 sodium to 3 potassium D. 3 sodium to 2 potassium E. 3 sodium to 1 potassium 14. ATP is best described as energy.

Explanation / Answer

Answers:

7. Option A

If the molecules were to move down their concentration gradient; there should not have an involvement of ATP molecules as enery was not required for the movement of molecules. However since energy is required it means the movement of the molecules are uphill that is against their concentration gradient.

Also sodium-potassium exchange pump leads to the export and import of molecules agaisnt their concentrations which requires the presence of ATP, and carier proteins.

8. Option B

Sodium -potassium pump is also known as Na+/k+ ATPase. This is due to the fact that at an expense of one molecule of ATP; three sodium ions are exported out of the cell and simultaneously two potassium ions are imported to the cell against their concentration gradients.

9. Option B

False.At an expense of one ATP molecule; three sodium ions are exported and likewise two potassium ions are imported into the cell.

10. Option A

Explanation: There are two types of transport made in a cell.; passive and active.Passive transport ways do not utilize ATP molecules while active transport molecules consume ATP molecules. Since in a sodium-potassium pump at an expense of one ATP molecule; three sodium ions move out of the cell while two potassium ions move into the cell; that is they move in opposite directions; this is considered as an example of antiport(where movement of molecules occurs in opposite directions)

11. Option D

Explanation: in a resting membrane state of a cell; the inside of the cell is rich is potassium ion concentration and the outside is rich in the sodium ion concentration. However from the leaky channels present on the surface of the plasma membrane; potassium ions diffuse outside to the cell thereby forming a concentration gradient.

Sodium-potassium pump is an example of an active transport wherein the movement of the molecules occurs against their concentration gradient. Hence at an expense of an ATP molecule; threes sodium ions are exported out from the cell whereas two potassium ions are imported to the cell.

12. Option B

A molecule of ATP is broken which provides the sufficient amount of energy for the active movement of ions against their concentration gradient into the cell. Likewise potassium ions move inside of the cell against their concentration gradient.

13. Option D

To every ATP molecule broken during the transport of the soduim and potasium ions; three sodium ions moves out of the cell whereas two potassium ions moves inside the cell.

14. ATP (Adenosine Tri Phosphate) is defined as the ATP currency of the cell.

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