The document discusses the structure of B-form DNA as identified by Watson and Crick. It describes B DNA as the idealized form of DNA found in vivo, characterized by a helical repeat of 10 base pairs per turn and distinct major and minor grooves. The first image in the table is suggested as the appropriate representation of this structure.

1. 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.