François Jacob was a French biologist who was awarded the ‘Nobel Prize in Physiology or Medicine’ in 1965 along with another French biologist Jacques Monod and French microbiologist Andre Lwoff for their discoveries regarding genetic control of enzyme and synthesis of virus. Jacob made many significant contributions in the field of genetics by successfully collaborating with other noted scientists like Monod and Lwoff while serving the renowned ‘Pasteur Institute’ of France. His most remarkable finding was recognizing the regulator genes that regulate the activities of the structural genes. He is also known for the Jacob-Monod operon model that helps in elucidating the way genes are controlled. They elucidated on the effects of balance and imbalance between regulator genes and structural genes in a normal cell. They also examined messenger ribonucleic acid (mRNA), which convey genetic information from the deoxyribonucleic acid (DNA) – carrier of genetic instructions to the ribosome – the protein synthesizer of the cell. He showed that similar standards with regard to natural preference and evolution are followed by bacteria as done by other higher organisms. He was awarded ‘Grand Prix Charles-Leopold Mayer’ in 1962 by ‘Académie des Sciences’. In 1973 he was elected as a ‘Foreign Member of the Royal Society’ (‘ForMemRS’).