DNA serves as a code for the structure of proteins synthesized by a cell. DNA is confined to the nucleus; however, proteins are produced in the cytoplasm.
RNA (ribonucleic acid) interprets the code in DNA and directs the synthesis of proteins in the cytoplasm.RNA molecules differ from DNA molecules in several ways. RNA molecules are usually single-stranded, and their nucleotides contain ribose rather than deoxyribose sugar. Like DNA, each RNA nucleotide contains one of four organic bases, but while adenine, cytosine, and guanine nucleotides occur in both DNA and RNA, thymine nucleotides are found only in DNA. In place of thymine nucleotides, RNA molecules contain uracil (U) nucleotides.