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Which of the following is NOT true of the different kinds of RNA in eukaryotes?

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Correct Answer: B. They all contain codons.
There are 3 types of RNA: (1) ribosomal RNA (rRNA); (2) messenger RNA (mRNA) and (3) transfer RNA (tRNA). RNA is a single-stranded polymer made up of four bases, namely uracil, adenine, guanine and cytosine. Only mRNA can contain a codon, a genetic code consisting of three base pairs that can be translated by the cellular machinery into an amino acid during protein synthesis. RNA elongates elongates from the 5? to 3? direction using a DNA strand with the opposite orientation as a template for transcription.
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