Question

which of the following is an example of facilitated diffusion? glucose entering a cell with the help of the transport molecule insulin all of these oxygen passing through a cell membrane from a high concentration to a low concentration potassium entering a cell via a special channel that requires energy

Explanation:

• Facilitated diffusion is a type of passive transport (no energy required) that uses transport proteins (channels or carriers) to move substances across the cell membrane down their concentration gradient.
• Glucose entering a cell with the help of a transport molecule (insulin is a hormone that signals the cell to allow glucose entry, but the actual transport is via a carrier protein, which is facilitated diffusion).
• Oxygen passing through a cell membrane is simple diffusion (no transport protein needed).
• Potassium entering a cell via a special channel that requires energy is active transport (as it requires energy).

Answer:

Glucose entering a cell with the help of the transport molecule insulin.