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difference between regular and diffuse reflection

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Question:How does active transport differ from simple diffusion?

Answers:Think about it this way Active- against the flow of a river regular diffusion- with the flow of a river

Question:Explain the similarities and differences between the following forms of transport: Diffusion, osmosis, facilitated diffusion, active transport, exocytosis, and endocytosis. Give an example for each for each type of transport and where it may occur in the body.

Answers:diffusion is the transport of solvent from higher concentration to lower concentration. osmosis is the movement of solvent from lower to higher concentration faciliated diffusion is the movement of solvent down the concentration gradient through channels(carrier molecules)...no energy is required. in active transport is the movement of substance in uphill direction...there is energy requirement(ATP.NA/K pump)

Question:Both passive diffusion and active transport are cell membrane functions. What's the difference?

Answers:Passive transport: - involves carriers, channels, or direct diffusion through a membrane. - always operates from regions of greater concentration to regions of lesser concentration. - No external source of energy is required. Active transport: - directly uses ATP (for Primary Active Transport) - possible to go against the concentration gradient. - a source of energy is required to move the carrier and its materials.

Question:I know that one of them is that diffusion is from a high to a low concentration whereas active transport is from a low to a high concentration. I'm not sure about the other difference though... Thank you!

Answers:The difference is that active transport requires energy, and can operate up the concentration gradient. Diffusion goes down the concentration gradient.