Answer:
D. One is in a ring form, the other is in a linear chain.
Step-by-step explanation:
An aldose sugar is a sugar molecule that contains an aldehyde functional group (-CHO), typically at the end of a carbon chain. It can form a ring structure by bonding with an alcohol group (-OH) on another carbon atom in the same molecule.
A ketose sugar, on the other hand, contains a ketone functional group (C=O) within the carbon chain. This ketone group is responsible for the formation of a ring structure by bonding with an alcohol group (-OH) on another carbon atom within the same molecule.
Both aldose and ketose sugars can exist in either linear or ring forms. In the presence of certain conditions, such as in solution, these sugars can undergo a chemical reaction called intramolecular cyclization, resulting in the formation of a ring structure.
In summary, the key difference between aldose and ketose sugars lies in the position of the carbonyl group. An aldose sugar has the carbonyl group at the end of the carbon chain, while a ketose sugar has the carbonyl group within the carbon chain. This distinction affects the overall structure and reactivity of these types of sugars.