Two of the five bases in nucleic acids, adenine (2) and guanine (3), are purines. In DNA, these bases form hydrogen bonds with their complementary pyrimidines thymine and cytosine, respectively. This is called complementary base pairing.In RNA, the complement of adenine is uracil instead of thymine.Other notable purines are hypoxanthine (4), xanthine (5), theobromine (6), caffeine (7), uric acid (8) and isoguanine (9).his is called complementary base pairing. In RNA, the complement of adenine is uracil instead of thymine. Other notable purines are hypoxanthine (4), xanthine (5), theobromine (6), caffeine (7), uric acid (8) and isoguanine (9).
This is the first or the topmost color in a rainbow. The color red first brings to mind the idea of love. This is the color of energy and enthusiasm. Red is also the color with the longest wavelength, and it symbolizes vibrancy and security. It has always been known to signify passion as well.
The colors you see in a rainbow come from millions of raindrops that are sitting at different angles in the sky. These raindrops split the sunlight into colors for your eyes to see. When you move toward the rainbow, the angles change. So millions of different raindrops create the new rainbow with the new angles.