Multiple Choice
Which of the following best explains why a glucose transporter is required to move glucose into the cell?
A physiologist observes that the concentration of sodium inside a cell is decidedly lower than that outside the cell. She also observes that there is a small leakage of sodium into the cell. What cellular process prevents the sodium concentration gradient from disappearing?
a. Osmosis
b. Diffusion
c. Primary active transport
d. Secondary active transport
____ ion concentration is high in extracellular fluids, and____ion concentration is high in the cytoplasm.
(a) Calcium; magnesium
(b) Chloride; sodium
(c) Potassium; sodium
(d) Sodium; potassium