In-Text Figure Based Questions
-How do small water-soluble molecules and ions diffuse across the plasma membrane? How do lipid-soluble molecules diffuse across the plasma membrane? (Figure 3-15)
A)______diffuse by osmosis; diffuse by carrier-mediated transport
B) diffuse by endocytosis; diffuse by pinocytosis
C) diffuse by carrier-mediated transport; diffuse by passive transport
D) diffuse directly through the plasma membrane; diffuse through membrane channels
E) diffuse through membrane channels; diffuse directly through the plasma membrane

Question

Quizplus · Accepted Answer

Small water-soluble molecules and ions typically diffuse through membrane channels due to their inability to pass directly through the lipid bilayer of the plasma membrane. Lipid-soluble molecules, on the other hand, can diffuse directly through the plasma membrane because they are compatible with the hydrophobic core of the membrane.