Diffusion Osmosis Worksheet Answers(1) 2i345z

J.o.I!'ll1rgyr..... oor,5er1 1. Definethe difusion andosmosis. 2. Explainthe term dffision gradient. 3. Distinguish between the hypertonic, hyp otoni c and i so tonic. 4. Describe two scientific developments that have helped change our understandingof the structure of membranesover recent years. 5. Describe the fluid mosaic model of membrane structure. JEI

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6. Calculate the SA/vol ratio of two cubes:the sides of cube A are 5 millimetres long; those of cube B are 10 millimetres. Identify which cube has the larger SA/vol ratio. 7. When blood cells are piaced in fresh water, they swell and burst. When they are placed in a strong salt solution, they shrink. Explain this observation. 8. Explain why there are no single-cell organismsas big as a dog. 9. The proteins present in a cell membrane vary, depending on the function of the cell. Propose a hypothesis to explain a role for theseproteins. 10. When animal cells are placed in sea water, they shrink as water flows out of the cell into the salt water becauseof osmosis.Use this principle to explain why salted meat can be kept for long periodsof time without 'going bad'.

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