Time-saving video on the circulatory system. The circulatory system transports nutrients and blood cells to and from cells throughout the body. The circulatory systems includes veins, arteries and capillaries.
Ribosomal RNA (rRNA) is found in the cell's ribosomes, the specialized structures that are the sites of protein synthesis). Transfer RNA (tRNA) found in the cytoplasm which carries amino acids to the ribosomes for incorporation into a protein.
1 Adenine and guanine are both found in DNA and RNA. 2  Cytosine, thymine and uracil are pyrmidines (contains a six membered ring of carbon and nitrogen).  Cytosine is found in both DNA and RNA, but thymine is only found in DNA and uracil is only found in RNA.