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The simple summary is that DNA makes RNA, and then RNA makes proteins. DNA, RNA and proteins all consist of a repeating structure of related building blocks (nucleotides in the case of DNA and RNA, amino acids in the case of proteins). In general, they are all unbranched polymers, and so can be represented in the form of a string.
The basic difference between DNA and RNA are, 1.DNA contains deoxyriose sugar moiety where RNA contains ribose sugar. 2.DNA is mostly double stranded whereas RNA are usually single stranded. 3.DNA is more stable than RNA and hence it has more advantage in evolution.