DNA Base Pairing Always GC AT?

jiji324 · #1 (**permalink**) 07-04-2008, 09:46 AM

Hi is DNA Base Pairing Always GC AT? or can there sometimes be differences in DNA?

ethidiumbromide · #2 (**permalink**) 07-04-2008, 07:38 PM

In general, yes it is always GC AT. This matching has to do with how the molecules fit together and a mismatch will cause a "bump" in the DNA. Usually when there is a mismatch it is done during copying, and one of the pair will be excised and replaced with the appropriate nucleotide. If the mismatch were to remain, it would be considered a bad mutation. Like something you would find in cancer cells.

dna_pol3 · #3 (**permalink**) 09-04-2008, 04:20 PM

Quote:

Originally Posted by jiji324

Hi is DNA Base Pairing Always GC AT? or can there sometimes be differences in DNA?

yes always is CG AT bcz of hydrogen biding between them. if it is not like this it is called mutation.
good luck

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DNA Base Pairing Always GC AT?

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