1) Caffeine is a nonpolar molecule. What is the most likely method by which it is absorbed into cells? a) Facilitated diffusion b) Osmosis c) active transport d) diffusion e) exocytosis 2) Cystic fibrosis is a disease caused by defective chloride ion transport into the lungs that results in thick, dehydrated mucus build up that promotes bacterial infection and other pathologies. What is the most likely cause of the defect that causes this disease? a) defective phagocytosis b) defective exocytosis c) defective osmosis d) defective transmembrane protein 3) Bacteriorhodopsin is an example of a ___(indicate all that apply) a) light-driven pump b) proton pump c) passive transporter d) coupled transporter e) transmembrane protein 4) The high intracellular concentration of K+ in a resting cell is partly due to: a) The K+ leak channels in the membrane b) the membrane potential c) the Na+/K+ pump d) voltage-gated K+ channels e) K+ stored in the endoplasmic reticulum.

1. 1) Caffeine is a nonpolar molecule. What is the most likely method by which it is absorbed into
cells? a) Facilitated diffusion b) Osmosis c) active transport d) diffusion e) exocytosis
2) Cystic fibrosis is a disease caused by defective chloride ion transport into the lungs that results
in thick, dehydrated mucus build up that promotes bacterial infection and other pathologies.
What is the most likely cause of the defect that causes this disease? a) defective phagocytosis b)
defective exocytosis c) defective osmosis d) defective transmembrane protein
3) Bacteriorhodopsin is an example of a ___(indicate all that apply) a) light-driven pump b)
proton pump c) passive transporter d) coupled transporter e) transmembrane protein
4) The high intracellular concentration of K+ in a resting cell is partly due to: a) The K+ leak
channels in the membrane b) the membrane potential c) the Na+/K+ pump d) voltage-gated K+
channels e) K+ stored in the endoplasmic reticulum