Ribose and deoxyribose are the pentose (five-carbon) sugar in nucleic acid. Ribose is present in RNA and deoxyribose is present in DNA.
Ribose and deoxyribose differ only by the chemical groups present at the 2’ carbon of molecule. Hydrogen atom (H) is present in Deoxyribose and hydroxyl group (OH) in Ribose.
In other words, (JUST TO REMEMBER) one can say deoxyribose contains one oxygen (O) atom less than ribose as the name suggest de-oxy ribose.