A sodium-potassium pump within a cell membrane
requires energy to move a sodium and potassium ions
into or out of a cell. The movement of glucose into or
out of a cell does not require energy. Which statement
BEST describes the movement of these materials
across a cell membrane?
A. Sodium and potassium ions move by active
transport, and glucose moves by osmosis.
B. Sodium and potassium ions move by active
transport, and glucose moves by facilitated
diffusion.
C. Sodium and potassium ions move by facilitated
diffusion, and glucose moves by osmosis.
D. Sodium and potassium ions move by facilitated
diffusion, and glucose moves by active transport.