Bases (nitrogen-containing rings) Purines N 8 7 9 5 4 6 5 6 3 ring numbering system 1 2 Pyrimidines N 2 1 N ring numbering system N ZH N H NH₂ N N NH₂ N N Adenine CH3 Cytosine N H N ZI NH N NH₂ Guanine NH O Thymine ZH NH O Uracil

Imagine you are working in a lab, and you are performing two chemical reactions. You notice that Reaction A occurs much faster than Reaction B, and that both reactions release the same amount of heat. Which of the following conclusions can be made from your observation? Reaction A has the same activation energy as Reaction B, and the AG of Reaction A is more negative (i.e., a larger negative number) than the AG for Reaction B. Reaction A has a lower activation energy than Reaction B, and the AG of Reaction A is the same as the AG of Reaction B. Reaction A has a higher activation energy than Reaction B, and the AG of Reaction A is the same as the AG of Reaction B. Reaction A has the same activation energy as Reaction B, and the AG of Reaction A is less negative (i.e., a smaller negative number) than the AG for Reaction B.

The folding of a protein  a   involves unfavorable entropy b   involves favorable entropy c   is non-spontaneous d   occurs at a high Temperature (>90 C)

For each of the five characteristics of life (DNA, RNA, Protein, Carbohydrates, and Lipids) provide a brief example of how each biomolecule can play a direct or indirect role.