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.
Answer:B
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.