1. As a person becomes very dehydrated, the concentration of water in her blood decreases. In which direction will water move across the plasma membranes of her blood cells? What will happen to the volume of the cells as a consequence? Why is proper hydration important for multicellular organisms?
2. Oops! You were cleaning out the aquariums in the biology lab and you accidentally placed the saltwater fish in the freshwater tank. What will happen to the cells of these fish?
3. In some countries, human waste is used as a fertilizer. If produce is grown in this type of fertilizer, it is possible that it will be contaminated with the protozoan that causes amoebic dysentery. One method of removing the protest without ruining the food is to place the produce in a 5% salt solution. Explain how this would kill the protest. If you cleaned your lettuce this way, what would happen to the lettuce cells? How could you return them to normal?
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