What is adenine always paired with?
In base pairing, adenine always pairs with thymine, and guanine always pairs with cytosine.
Are purines basic?
A purine is an aromatic heterocyclic nitrogen compound, composed of a pyrimidine ring system fused to an imidazole ring system, with the core molecular formula C5H4N4. Purines are weakly basic compounds.
What would happen if two purines bonded?
If the purines in DNA strands bonded to each other instead of to the pyrimidines, they would be so wide that the pyrimidines would not be able to reach other pyrimidines or purines on the other side! The space between them would be so large that the DNA strand would not be able to be held together.
What is the difference between pyrimidines and purines?
Adenine and guanine are the two purines and cytosine, thymine and uracil are the three pyrimidines. The main difference between purines and pyrimidines is that purines contain a sixmembered nitrogencontaining ring fused to an imidazole ring whereas pyrimidines contain only a sixmembered nitrogencontaining ring.
What are the 2 bases of purines?
Purine bases include adenine (6-aminopurine) and guanine (2-amino-6-oxypurine) (Fig. 6.3). Figure 6.3. Purine bases.
What are purines and examples?
Purines are the most widely occurring heterocyclic molecules that contain nitrogen. Examples of purines include caffeine, xanthine, hypoxanthine, uric acid, theobromine, and the nitrogenous bases adenine and guanine. Purines serve much the same function as pyrimidines in organisms.