Question

1. using the illustration below, which type of transport is needed to get the glucose through the cell membrane?

osmosis
diffusion
active
facilitated diffusion

Explanation:

• Osmosis is the movement of water molecules across a semi - permeable membrane. Since the question is about glucose transport, osmosis is incorrect.
• Diffusion is the movement of small non - polar molecules (like oxygen in the diagram) directly through the phospholipid bilayer. Glucose is a larger polar molecule and cannot pass through simple diffusion.
• Active transport requires energy (usually ATP) to move molecules against their concentration gradient. There is no indication of energy use (like ATP hydrolysis) in the diagram for glucose transport.
• Facilitated diffusion uses transport proteins (like the protein labeled A in the diagram) to move molecules (such as glucose, which is polar and relatively large) down their concentration gradient. This matches the mechanism shown for glucose transport in the illustration.

Answer:

Facilitated Diffusion