Question

complete the table to compare simple diffusion and facilitated diffusion. simple diffusion facilitated diffusion molecules move from areas of high concentration to areas of low concentration molecules pass directly through the phospholipids in the cell membrane molecules pass through proteins in the cell membrane large or charged molecules can move across the cell membrane molecules move across the cell membrane without needing cellular energy

Explanation:

• For "molecules move from areas of high concentration to areas of low concentration": Both simple diffusion and facilitated diffusion are passive transport processes. In passive transport, molecules move down their concentration gradient (from high to low concentration). So, both should have a checkmark.
• For "molecules pass directly through the phospholipids in the cell membrane": Simple diffusion involves non - polar molecules (like oxygen, carbon dioxide) passing directly through the phospholipid bilayer. Facilitated diffusion uses transport proteins (channel or carrier proteins), so this is only for simple diffusion.
• For "molecules pass through proteins in the cell membrane": Facilitated diffusion requires proteins (either channel proteins for ions or carrier proteins for larger polar molecules like glucose). Simple diffusion does not use proteins in this way, so this is only for facilitated diffusion.
• For "large or charged molecules can move across the cell membrane": Simple diffusion is limited to small non - polar molecules. Facilitated diffusion can handle larger polar molecules (e.g., glucose) or ions (e.g., \(Na^{+}\), \(K^{+}\)), so this is only for facilitated diffusion.
• For "molecules move across the cell membrane without needing cellular energy": Both simple and facilitated diffusion are passive transport. Passive transport does not require ATP (cellular energy) as the molecules move down their concentration gradient. So, both should have a checkmark.

Answer:

	simple diffusion	facilitated diffusion
molecules pass directly through the phospholipids in the cell membrane	✔️
molecules pass through proteins in the cell membrane		✔️
large or charged molecules can move across the cell membrane		✔️
molecules move across the cell membrane without needing cellular energy	✔️	✔️