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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.
1 Ribosomal RNA (rRNA) is a component of cell organelles called ribosomes. 2  A ribosome consists of ribosomal proteins and rRNA. 3  Ribosomes are typically composed of two subunits: a large subunit and a small subunit. 4  Ribosomal subunits are synthesized in the nucleus by the nucleolus.NA molecules are produced in the nucleus of our cells and can also be found in the cytoplasm. The three primary types of RNA molecules are messenger RNA, transfer RNA and ribosomal RNA. Some RNAs, known as small regulatory RNAs, have the ability to regulate gene expression.