Purines and pyrimidines exist in two tautomeric forms (lactam and lactim);nucleosides exist in two conformations (syn and anti).The most common forms found in cells are
A)lactam and anti.
B)lactam and syn.
C)lactim and anti.
D)lactim and syn.

Question

Quizplus · Accepted Answer

The most common forms of purines and pyrimidines in cells are the lactam form, and nucleosides most commonly adopt the anti conformation. This is due to the stability and hydrogen bonding patterns that are favorable in biological systems.

Purines and Pyrimidines Exist in Two Tautomeric Forms (Lactam and Lactim);nucleosides