How are polar molecules like glucose transported across a membrane?
A) There are holes in the membrane.
B) There are proteins that allow the transportation of polar molecules across the membrane.
C) Polar molecules cannot ever enter the cell.
D) Polar molecules diffuse across the hydrophobic barrier.

Question

Quizplus · Accepted Answer

Polar molecules like glucose are unable to diffuse across the hydrophobic barrier of the membrane. Instead, they require specialized transport proteins such as carrier proteins or channel proteins to assist their movement across the membrane. These proteins provide a pathway for the polar molecules to travel through, allowing them to enter or exit the cell as needed.

How Are Polar Molecules Like Glucose Transported Across a Membrane