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Monosaccharides

is a hexose (6 carbon atoms) of the aldose type (aldehyde group, –CH=O): an aldohexose. Here it is shown on its most stable form, a 6-atom ring or pyranose: glucopyranose.

the anomeric carbon.

You can see the form of the pyranose ring (without hydrogens).
the hydrogens.


is a hexose (6 carbon atoms) of the ketose type (ketone group, >C=O): a ketohexose. It is shown on its most stable form, a 5-atom ring or furanose: fructofuranose.

the anomeric carbon.

Turning

#1 corresponds to the convention for defining alpha = downwards and beta = upwards: the ring O to the back, the anomeric C to the right.