Cellulose (IMAGE) American Society of Plant Biologists Caption The above figure from the Department of Energy depicts cellulose structure and poses central research questions that need to be answered to transition the nation's transportation sector to cellulosic ethanol. Credit None 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.