1. While trying to determine the structure of DNA, Watson and Crick at one point proposed that like bases are bonded to like bases. For example, thymine would be bonded to thymine, cytosine would be bonded to cytosine, and so on. Explain why this proposed model would not fit based on what was discovered to be true about DNA.

2. In your own words describe the various types of bonds that are found in the structure of DNA and the roles they play in stabilizing the DNA molecule. Describe the chemical nature of the DNA molecule as best as you can.

3. Numerous enzymes are involved in the process of DNA replication. Select a few of these enzymes (three ideally), and explain the impact on DNA replication if the enzymes you've chosen were defective.