PDF DNA Structure Worksheets - Radford University Refer to the drawing of double-stranded DNA. Find, circle, and label the following: a. a phosphate group b. the deoxyribose groups at both ends of the DNA strands c. the guanines ... A list of nine structure files containing double-stranded DNA sequences is shown below. 1AWC.cn3 1K2Z.cn31R0O.cn3 1HCR_A.cn31K61.cn31R4R.cn3