Fructose:This is a simple sugar found in many plants. It's an example of a ketose sugar because it contains a ketone group.
Ribulose: A five-carbon ketose sugar, ribulose plays a role in photosynthesis.
Seduheptulose: An example of a seven-carbon ketose sugar, sedoheptulose plays a role in the pentose phosphate pathway, an important process for energy production.