0 0 votes The 4-amino or 4-keto group of pyrimidine bases is located in the major groove of the double stranded DNA minor groove of the double stranded DNA minor groove of the B form DNA but not the A form DNA major groove of the B form DNA but not the A form DNA Recombinant DNA technology and Other Tools in Biotechnology gate2014 dna molecular-biology biochemistry + – Milicevic3306 7.9k points answer comment Share Follow 0 reply Please log in or register to add a comment.