2.6-

Question 1

Passive transport is the net movement of molecules from

Answer 1

high concentration to low concentration without the direct input of metabolic energy (ATP)

Question 2

Passive transport plays a primary role

Answer 2

in the import of materials and the export of wastes.

Question 3

Active transport requires the

Answer 3

direct input of energy to move molecules from regions of low concentration to regions of high concentration.

Question 4

The selective permeability of membranes allows for the

Answer 4

formation of concentration gradients of solutes across the membrane.

Question 5

The processes of endocytosis and exocytosis require

Answer 5

energy to move large molecules into and out of cells—

Question 6

a. In exocytosis,

Answer 6

transport vesicles migrate to the membrane, fuse with it, and release their contents outside the cell

Question 7

In endocytosis,

Answer 7

the cell takes in macromolecules by forming vesicles from the plasma membrane