Transcription and translation are two processes of protein synthesis. First, transcription occurs. The DNA in the nucleus unwinds and exposes the nucleotide bases. Then the RNA nucleotides find and match with their base partners on one of the DNA strands. They form hydrogen bonds with complementary bases, but since RNA differs from DNA with one base, DNA's Thymine is replaced by RNA's Uracil. Therefore, Adenine pairs with Uracil. Then the RNA polymerase binds these new RNA nucleotides together to form a complementary copy of the DNA strand, named messenger RNA (mRNA). On other strands, the cell produces transfer, known as tRNA. Once in their final form, the molecules play a vital role in protein synthesis. This leads to the process of translation. Translation is where the genetic code from the original sequence of DNA is 'translated' into a sequence of amino acids in the final protein. This starts when the mRNA strand attaches to a ribosome, the workbench of protein assembly. When the mRNA is properly positioned, it triggers the approach of a tRNA, which carries the first amino acid. tRNA attaches only if its anticodons match the corresponding codons of the mRNA strand. Then another tRNA will come and do the exact same. The amino acids are chemically bonded by the ribosome. The same process continues until the coon on the mRNA does not code for an amino acid. In the end, a long chain of amino acids is formed. The amino acids are joined by peptide bonds, which forms a polypeptide bond, which in the end is a small protein.