DNA (Deoxyribonucleic Acid) consist of two strand,the sugar in DNA is deoxyribose ,wich contains one less hydroxy group than RNA group and DNA is more stable molecule than RNA
on the other hand RNA(Rebonucleic Acid)only has one strand,it contains ribose sugar molecules and RNA is more resistance to damage from UV than DNA.
RNA is single stranded nucleic acid having Uracil and Ribose sugar at the place of Thymine and Deoxy-Ribose sugar unlike DNA. DNA is double helical structure having Thymine and Deoxy-Ribose at the place of Uracil & Ribose sugar unlike RNA.