Question

Which statement best describes the movement of sodium ions across the cell membrane?

They are hydrophilic, so their movement needs to be facilitated by transport proteins.
They are hydrophobic, so their movement needs to be facilitated by transport proteins.
They are hydrophilic, so they easily pass across the cell membrane on their own.
They are hydrophobic, so they easily pass across the cell membrane on their own.

Answer 1

Answer: A. They are hydrophilic, so their movement needs to be facilitated by transported proteins.

Step-by-step explanation: