BSC
Lucci_Prelab5_Monday

Passive diffusion requires no energy expenditure on

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Passive – diffusion, requires no energy expenditure on the part of the cell Active – requires the cell to expend energy to activate “pumps” which transport materials through the membrane. Exercise 5.1: 6. Name the mechanism for diffusion and describe its motion. Brownian Movement, zigzag motion caused by constant molecular collisions between water & carmine. 7. What factor affecting the rate of diffusion is studied in this exercise? Temperature Exercise 5.2: 8. In this exercise what’s acting as a) the solutes, b) the solvent? a) solutes – Methylene blue & potassium permanganate b) solvent - Agar
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9. What two factors affecting the rate of diffusion are studied in this exercise? Molecular weight & solubility Exercise 5.3: 10. What are the a) solutes, b) solvent in this exercise? a) solutes – NH 3 & HCl b) solvent – diffusion tube 11. What two factors affecting the rate of diffusion are studied in this exercise? Molecular weight & gas density Exercise 5.4: 12. Differentiate between osmosis and dialysis. (Note that both are special cases of diffusion). Osmosis – Movement of a solvent, usually water in biological systems, through a semi permeable membrane, from an area of greater concentration to an area of lower concentration. Dialysis – Movement of solutes through a semi permeable membrane. 13. Define: a) isotonic, b) hypotonic, c) hypertonic.
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