Consider the two beakers with grapes and soda:

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Presentation transcript:

Consider the two beakers with grapes and soda: Green grapes – peeled off Purple grapes – not peeled. J Describe what you see in words and a drawing. Try to explain why this happens. Suggest a way to confirm your explanation.

Membrane Structure Introduction Membrane structure

Properties of Water H2O Water Molecules are Polar:

Water Molecules are Polar: Notes Electrons spend more time around the O than the H. The “O” side is more negative and “H” side more positive. The + and – sides attract one another  Water is Sticky!

Polar Solute - + Non-Polar

Non-polar substances – Do not mix well with water (Sugar, Salt, Water colors…) Notes Non-polar substances – Do not mix well with water (Oils, waxes, Fats) The same can be said In other terms..

Half hydrophobic, half hydrophilic: Hydrophilic – “loves” water Hydrophobic – “hates” water (or rather – hated by water) Totally hydrophobic: Oil Half hydrophobic, half hydrophilic: phospholipids Notes Membrane structure

Membrane structure

Biological membranes are Non-charged particles semi-permeable Pass easily: Small molecules Non-charged particles WATER! Pass only with help: Large particles Ions ? Notes