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.
The bases found in DNA are guanine, cytosine, adenine, and thymine. The bases found in RNA are guanine, cytosine, adenine, and uracil. Uracil forms two hydrogen bonds with adenine and functions just like thymine does. It's simply used in RNA instead of thymine.