Now, inside the cells of our body, this reaction is a product favorite reaction and that's because of two important reasons. Number one is this reaction is energetically favorable. Why? Well, recall that if we want to transform glucose into glucose one phosphate, we actually have to utilize and hydrolyze an ATP molecule. So normally if we want to transform glucose into glucose one phosphate, we have to use an ATP molecule. But let's see what happens in this particular reaction.