2.8

Question 1

External environments can be

Answer 1

hypotonic, hypertonic or isotonic to internal environments of cells

Question 2

Water moves by osmosis from

Answer 2

areas of high water potential/low osmolarity/ low solute concentration to areas of low water potential/high osmolarity/high solute concentration.

Question 3

Growth and homeostasis are maintained

Answer 3

by the constant movement of molecules across membranes.

Question 4

Osmoregulation maintains

Answer 4

water balance and allows organisms to control their internal solute composition/water potential.

Question 5

A variety of processes allow for the movement of ions and other molecules across

Answer 5

membranes, including passive and active transport, endocytosis and exocytosis.

Question 6

Membranes and membrane-bound organelles in eukaryotic cells

Answer 6

compartmentalize intracellular metabolic processes and specific enzymatic reactions.

Question 7

Internal membranes facilitate

Answer 7

cellular processes by minimizing competing interactions and by increasing surface areas where reactions can occur.