DNA and RNA has a sugar-phosphate backbone with nucleotide bases attached to it. DNA and RNA also contains the bases adenine (A), cytosine (C), and guanine (G); however, RNA does not contain thymine, instead, RNA's fourth nucleotide is the base uracil (U). DNA is a double-stranded molecule while RNA is a single-stranded molecule. RNA is the main genetic material used in the organisms called viruses, and RNA is also essential in the production of proteins in other living organisms. RNA can circulate around the cells of living organisms and thus serve as a sort of genetic messenger, conveying the information stored in the cell's DNA out from the nucleus to other parts of the cell where it is used to help manufacture proteins.
Available at: http://www.visionlearning.com/library/module_viewer.php?mid=63(accessed
(29 June 2008)
Regards
Aziyani
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