Which substances can pass directly through the plasma membrane?
A) carbohydrate-bound
B) water soluble
C) lipid insoluble
D) iron soluble
E) lipid soluble

Question

Quizplus · Accepted Answer

Only lipid-soluble substances can pass directly through the plasma membrane. Lipid-insoluble substances, such as carbohydrates and water-soluble substances, require assistance from transport proteins or channels to pass across the membrane. Iron can also require specific transporters to pass through the membrane.

Which Substances Can Pass Directly Through the Plasma Membrane