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Messenger RNA (mRNA) carries the DNA instructions for building the protein, transfer RNA (tRNA) carries the appropriate amino acid to the ribosome, and ribosomal RNA (rRNA) is the major component of a ribosome, the structure that reads codons on the mRNA and assembles amino acids into polypeptides.NA nucleotides contain a sugar called ribose; DNA nucleotides contain a similar sugar called deoxyribose. RNA has the nitrogenous base uracil, which behaves similarly to the thymine in DNA-that is, both uracil and thymine form complementary base pairs with adenine.
it codes for the incorporation of the amino acid methionine (Met) into the growing polypeptide chain The genetic code can be expressed as either RNA codons or DNA codons. RNA codons occur in messenger RNA (mRNA) and are the codons that are actually read during the synthesis of polypeptides (the process called translation). But each mRNA molecule acquires its sequence of nucleotides by transcription from the corresponding gene.