If a transport protein moves two solutes across a membrane in opposite directions, the protein is called a countertransporter or _________.
Fill in the blank with correct word.
(
Question 2) The sodium-potassium ATPase functions by performing
A. primary active transport.
B. secondary active transport.
C. exocytosis.
D. both exocytosis and endocytosis.
E. receptor-mediated endocytosis.
(
Question 3) The sodium-potassium pump moves
A. sodium and potassium into the cell.
B. sodium and potassium out of the cell.
C. sodium into the cell and potassium out of the cell.
D. sodium out of the cell and potassium into the cell.
(
Question 4) The sodium-potassium pump moves ions against their concentration gradients and helps maintain an electrochemical gradient across the plasma membrane.
Indicate whether this statement is true or false.
(
Question 5) Physiological saline contains the same concentration of solutes as the inside of a cell, and it is therefore a(n) __________ solution.
Fill in the blank with correct word.
(
Question 6) Consider a cell with a total internal solute concentration of 0.9. Placing the cell in which bath solution would result in creation of the greatest osmotic pressure in the cell?
A. 0.5 NaCl
B. 0.9 NaCl
C. 1.2 NaCl
(
Question 7) Placing a red blood cell in an extremely hypertonic solution leads to hemolysis.
Indicate whether this statement is true or false.
(
Question 8) Cell shrinking, also known as crenation, occurs when a cell is placed into a(n) _________ solution.
A. isotonic
B. hypertonic
C. hypotonic
D. exergonic
(
Question 9) When a cell is placed in a solution with a very low solute concentration, water diffuses into the cell. Such a solution is called a(n) _________ solution.
A. hypertonic
B. hypotonic
C. isotonic
D. endergonic
(
Question 10) Coupled transport that involves the moving of one substance against its concentration gradient by using energy from a second substance moving down its concentration gradient is known as
A. primary active transport.
B. receptor-mediated endocytosis.
C. bulk transport.
D. sympathetic exocytosis.
E. secondary active transport.
Quick Reply
