2.9-2.11

Question 1

Describe the processes that allow ions and other molecules to move across membranes.

Answer 1

A variety of processes- passive and active transport, endocytosis and exocytosis.

Question 2

Membranes and membrane-bound organelles in eukaryotic cells

Answer 2

compartmentalize extracellular metabolic processes and specific enzymatic reactions.

Question 3

Internal membranes facilitate

Answer 3

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

Question 4

Membrane-bound organelles evolved

Answer 4

from once free-living prokaryotic cells via endosymbiosis.

Question 5

Prokaryotes generally lack

Answer 5

internal membrane bound organelles but have internal regions with specialized structures and functions.

Question 6

Eukaryotic cells maintain

Answer 6

internal membranes that partition the cell into specialized regions.