Protein synthesis in cell. Cutaway artwork of the inside of a cell,showing proteins (pink,one at bottom left) being synthesized by ribosomes (blue,one at lower left). The instructions for building the proteins are encoded in strands of messenger ribonucleic acid (mRNA,yellow). mRNA originates in the nucleus (brown,lower right),and is a copy of the information coded in DNA (deoxyribonucleic acid,in the nucleus). Transfer RNA (tRNA,orange strands) brings amino acids (pink) to a ribosome,where they are joined in a sequence determined by the mRNA. Different sequences produce different proteins. The cell membrane,with transmembrane proteins (lumps,upper right),is also seen |