Q PRE-LAB QUESTIONS 1. Nitrogen fixation is a natural process by which inert or unreactive forms of nitrogen are transformed into usable nitrogen. Why is this process important to life? 2. Given what you have learned about the hydrogen bonding shared between nucleic acids in DNA, which pair is more stable under increasing heat: adenine and thymine, or cytosine and guanine? Explain why.3. Which of the following is not an organic molecule: methane (CH4), fructose (C6H12O6), rosane (C20H36), or ammonia (NH3)? How do you know?