The DNA molecule in the nucleus is unzipped by an enzyme called
polymerase. From one of these single strands of a DNA molecule, a mRNA molecule
between two exons and attaches the opposing base pairs to the backbone of the
molecule except that the thymine has been replaced with uracil. The formation of
this molecule allows for the construction of proteins in the ribosome without
risking the DNA in the cytoplasm.
The mRNA travels through the cell to a ribosome. Here tRNA which contain
the appropriate anti-codon collect the amino acids coded for in the mRNA. Each
amino acid is connected to the next amino acid. The mRNA thus transverses the
ribosome with each three nitrogen base condon selecting an amino acid. This
continues until the ribosome encounters a stop condon. When this happens the
amino acid chain is released from the tRNA and is a protein.
This process allows for the genetic information stored in the DNA to be