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29 Sep

An interesting look into why DNA and RNA might use different nucleic acids for what seems to be essentially the same purpose (namely Thymine and Uracil).

Earthling Nature

by Piter Kehoma Boll

ResearchBlogging.org About a year ago, while I was in my class of Techniques of Molecular Diagnosis, an interesting doubt sprouted: why does DNA use thymine instead of uracil as RNA does?

I hope everybody reading this knows about nucleic acids and the difference between DNA and RNA. As a very quick review:

RNA (ribonucleic acid) is a polymer made of ribonucleotides, compound molecules made of three parts, or smaller molecules: a nitrogenous base (adenine, uracil, cytosine or guanine), a ribose sugar and a phosphate group.

DNA (deoxyribonucleic acid) is similar, but instead of uracil it has thymine, and instead of a ribose sugar is has a deoxyribose, so that it is made of deoxyribonucleotides. Another difference is that DNA is a double chain twisted helicoidally, where two nitrogenous bases (each from one of the chains) are connected. Adenine is always connected to thymine and cytosine always to…

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Posted by on September 29, 2012 in Uncategorized

 

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