Use the information in the table to select the image that represents the structure of B-form DNA. Solution First one represents the B DNA The structure identified by Watson and Crick, is known as B DNA and is believed to be the idealised form of the structure adopted by virtually all DNA in vivo. It is characterized by a helical repeat of 10 bp/turn by the presence of base pairs lying on the helix axis and almost perpendicular to it, and by having well defined, deep major and minor grooves..