What types of RNA molecules are known to you? What are their functions?

Three main types of RNA are distinguished, differing in structure, size of molecules, location in the cell, and functions performed.
Ribosomal RNAs (rRNAs) are synthesized mainly in the nucleolus and make up approximately 85% of all cell RNAs. They are part of the ribosomes and participate in the formation of the active center of the ribosome, where the process of protein biosynthesis takes place.
Transport RNAs (tRNAs) form in the nucleus on DNA, then pass into the cytoplasm. They make up about 10% of cellular RNA and are the smallest in size RNA, consisting of 70-100 nucleotides. Each tRNA attaches a specific amino acid and transports it to the assembly site of the polypeptide in the ribosome.
Informational, or messenger, RNAs (mRNAs) make up about 5% of all cellular RNA. They are synthesized on a site of one of the chains of the DNA molecule and transmit information about the structure of the protein from the cell nucleus to the ribosomes, where the protein chain is synthesized from individual amino acid residues.

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