Which of the following statements is true for all types of passive transport?
A) Proteins are needed to transport molecules across the membrane.
B) The concentration gradient is the driving force.
C) Only small polar molecules are able to cross the plasma membrane.
D) Ions never cross the plasma membrane by passive transport.

Question

Quizplus · Accepted Answer

The concentration gradient is the driving force for all types of passive transport, including diffusion, osmosis, and facilitated diffusion. Proteins may or may not be needed depending on the specific type of passive transport, and both small polar molecules and ions can cross the plasma membrane by passive transport depending on their size, charge, and the presence of specific channels or transporters. Therefore, B is the only statement that is true for all types of passive transport.

Which of the Following Statements Is True for All Types