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1 . Explain how the following types of bonds are formed , and give an example of each :
3 . In agricultural areas , farmers pay close attention to the weather forecast . Right before a predicted overnight freeze , farmers spray water on crops to protect the plants . Use the properties of water to explain how this works . Be sure to mention why hydrogen bonds are responsible for this phenomenon .
4 . The following are pH values : cola-2 ; orange juice-3 ; beer-4 ; coffee-5 ; human blood-7.4 . Which of these liquids has the highest concentration of OH- ?
5 . List the four major classes or groups of biologically important macromolecules and explain one reason for the importance of each .
6 . Explain what denaturing of a protein is and what conditions might cause it .
7 . Describe three differences between DNA and RNA .