<prompt> If one strand of DNA contains the sequence ATCGCGTAACATGGATTCGG, what will be the sequence of the complementary strand using the standard convention?TAGCGCATTGTACCTAAGCCCCGAATCCATGTTACGCGATATCGCGTAACATGGATTCGGNone of the above  <response>: If one strand of DNA contains the sequence 5 ATCGCGTAACATGGATTCGG 3 the sequence of the complementary strand will be 5 CCGAATCCATGTTACGCGAT 3 DNA and RNA are directional molecules. They are always written in the sequence of 5 to 3. Phosphodiester bonds link the 3- and 5-carbons of adjacent monomers. Each end of a nucleotide polymer thus is distinct. We therefore refer to the 5-end or the 3-end of a polynucleotide, the 5-end being that with a free or phosphorylated 5-hydroxyl group. DNA sequences are complementary and antiparallel to each other. So, the complementary sequence of ATCGCGTAACATGGATTCGG will be CCGAATCCATGTTACGCGAT. Note: In question or answer option if nothing is mentioned about the direction of the sequence, you have to automatically assume that they are asking in 5-3 direction as it is internationally accepted convention. 