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Dec 18, DNA consists of two strands, arranged in a double helix These strands are made up of subunits called nucleotides Each nucleotide contains a phosphate, a 5carbon sugar molecule and a nitrogenous base RNA only has one strand, but like DNA, is made up of nucleotides RNA strands are shorter than DNA strandsDNA and rna essential idea The structure of DNA allows efficient storage of genetic information • The nucleic acids DNA and RNA are polymers of nucleotides • DNA differs from RNA in the number of strands present, the base composition and the type of pentose • DNA is a double helix made of two antiparallel strands of nucleotidesFeb 22, 01a, Top, genomic structureRed and green boxes represent exons in different DNA strands Arrows indicate the origin of transcription on each strand A mutant, mod(mdg4) u1, is shown here that Transcription An Overview Of Dna Transcription Article Khan Academy Model of dna and rna strands