Pentose
Pentose is a five-carbon simple carbohydrate (monosaccharide)[1]. An example of a pentose sugar would be ribose in RNA and deoxyribose in DNA.
There are 2 types of pentoses; ketopentoses and aldopentoses. Ketopentoses have a ketone functional group located at position 2 or 3 of the pentose ring. Aldopentoses have an aldehyde functional group located at position 1 of the pentose ring[2].