Spot the Differences

This month, we've talked about three different types of sugar molecules - sucrose, glucose, and fructose. But what do they look like? The pictures below show these three molecules, and some other types of sugars, some of which may sound familiar:
Notice that all of the sugars are made from only three elements: carbon (C), hydrogen (H), and oxygen (O). It should also be pointed out that there is actually a carbon atom at each of the corners of the hexagons and pentagon, but the picture gets too crowded if we show them all.

Even though these sugars are very similar, there are little differences. Look carefully at these pictures, and see how many of those differences you can spot!