bio exam 2

Water crosses the plasma membrane through cotransport. through facilitated diffusion or diffusion. using a process that requires energy from the cell. through active transport. against its concentration gradient.

through facilitated diffusion or diffusion.

The sodium-potassium pump uses energy from ATP to move sodium ions out of the cell, and potassium ions into the cell. This is an example of facilitated diffusion. exocytosis. diffusion. active transport. passive transport.

active transport

The plasma membrane forms a pocket that pinches inward, forming a vesicle that contains material from outside the cell. This describes the process of active transport. passive transport. endocytosis. diffusion. exocytosis.

endocytosis.

A molecule moves down its concentration gradient using a transport protein in the plasma membrane. This is an example of active transport. exocytosis. endocytosis. facilitated diffusion. diffusion.

facilitated diffusion.

Open Hint for Question 1 in a new window In active transport, A. no energy input is required from the cell. B. a vesicle inside the cell fuses with the plasma membrane and releases its contents outside the cell. C. molecules move across the plasma membrane by crossing the lipid bilayer directly, rather than by using a transport protein. D. the plasma membrane forms a pocket that pinches inward, forming a vesicle that contains material from outside the cell. E. molecules move across the plasma membrane against their concentration gradient.

molecules move across the plasma membrane against their concentration gradient.