'Molecular Conveyor Belts' (IMAGE) Goethe University Frankfurt Caption In baker's yeast, various enzymes compete for sugar molecules that are introduced into the cell by transport proteins. So that the sugar is converted only by enzymes that deliver products desirable from a biotechnological perspective (green ovals), these are connected to the transporter directly via a docking station (picture on the right). Credit GU Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.