The molecular formula for glucose is C6H12O6. Glucose is a simple sugar and an essential carbohydrate that serves as a primary source of energy for cells in many organisms. It plays a crucial role in cellular respiration, where it is metabolized to produce ATP, the energy currency of the cell. Understanding glucose's molecular structure helps in studying its metabolic pathways, including glycolysis and the Krebs cycle. It is not only vital for energy production but also serves as a building block for other essential biomolecules.