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There are hydrogen bonds that hold the DNA base pairs together
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the answer is true if not then sorry but i dont know very well
The lengthier that organisms have been detached the greater
amount of random mutation would have arisen, and thus the larger the amount of
different amino acids in the same proteins.
These changes are probable to be in regions that don't
involve the active site, otherwise the protein would not function giving a obsolete
organism. Similarly genes that encrypt proteins that are very vital to cellular
function will be very similar in many animals despite having a common ancestor
hundreds of years ago. This is because a small mutation in a very important
gene is likely to stop its function and thus kill the cell. However proteins
that are not so indispensable or present in many copies may be very different
in different animals
hope it helps
