The landmark ideas of Watson and Crick relied heavily on the work of ... In other words, the total amount of purines (A + G) and the total amount of pyrimidines (C + T) are usually nearly equal.

In the early 1950s, the race to discover DNA was on. At Cambridge University, graduate student Francis Crick and research fellow James Watson (b. 1928) had become interested, impressed especially ...

It differs from adenosine by the absence of an amino group at the 6 position of the purine ring. (Image ... base of an anticodon is less stringent than the standard Watson-Crick base pairing. This ...

Chemical structure of guanine, showing its double-ring purine structure and the functional groups involved ... The most common tautomer is the keto form, which is the form that participates in ...