Question

Channel proteins allow ions that would not normally pass through the cell membrane to go through the channel. What properties of the proteins are responsible for this?

• A. The channels are often composed of charged or polar R groups
• B. The channels are often composed of hydrophobic R groups
• C. a and b
• D. None of the above

Answer 1

Answer: (A)

The charged or polar lining of the channel proteins allows passage of polar and charged molecules.