Question

1. what is the difference between diffusion and facilitated diffusion? what is an example of a molecule that would require facilitated diffusion to enter a cell? 8. diffusion and osmosis are passive transport. how is active transport different?

Explanation:

1. Simple diffusion is the movement of small, non - polar molecules from high to low concentration without a transport protein. Facilitated diffusion is for larger or polar molecules that need a transport protein (channel or carrier) to cross the membrane. For example, glucose enters cells via facilitated diffusion using a glucose transporter.
2. Diffusion and osmosis are passive transport processes that rely on a concentration gradient and do not require energy. Active transport moves substances against the concentration gradient and requires energy (usually ATP).

Answer:

1. The difference between simple and facilitated diffusion is that simple diffusion is for small non - polar molecules and doesn't need a transport protein, while facilitated diffusion is for larger or polar molecules and requires a transport protein. An example of a molecule that uses facilitated diffusion to enter a cell is glucose.
2. Diffusion and osmosis are passive transport, which rely on a concentration gradient and no energy input. Active transport is different as it moves substances against the concentration gradient and requires energy.