Question

how does the presence of thymine in DNA confer additional stability to DNA?

Answer 1

thymine is more stable and by having thymine, it's easier to find the errors and have them corrected in DNA sequences

Answer 2

yea!i do knw tat and hence the question!but wat makes thymine more stable?

Answer 3

If you look at the structure of thymine which are only present in DNA compared their analog in RNA which are uracil , you will find that thymine contains an extra methyl group at the 6 position, going counterclockwise from the top. The extra methyl increases the overall stability of the thymine ring and is less prone degradation enzymes. Conversely the RNA thymine equivalent, uracil does not have the methyl, so it is easier degraded than thymine in DNA.

The overall picture reflects that DNA is used for long term genetic information storage, so it needs a more robust base pair like thymine, while RNA is only a temporary copy so uracil suffices for RNA since it will need to be regulated periodically.

Answer 4

the H2 bonds