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____ ______ ______ ______ ______ ________ __ __ _ ___ ___ __ rMA L 1 Sjv lACl14 :2ro+ty }CeiI It(UhOr1 Sc , 7 v 4 c l Q i Ic 1 Regulationand Reproduction Ne Class Date Structure of DNA and RNA Deoxyribonucleic acid (DNA) and bonucIeic acid (ANA) are two of the cell’s most Important molecules. These nucleic acids have a complex three-dimensional structure that enab les them to direct protein synthesis in the cell. • Study the structure of the DNA and RNA molecules shown below. Fill in the missing labels. Then com plete the chart and answer the questions. DNA RNA Name Sugar Basea Number of Nudeotide Strands iDNA FINA 1. The two DNA strands twist around each other. This is called a__ _________________ 2. The repeating units of make the backbone of DNA and RNA. 3. in a DNA molecule, the nitrogen bases of one strand attach to the nitro gen bases of the other by following the___________________ rule. The bases are held toge ther by 4. A strand of DNA contains the following bases: ATCOACT. What will be the bases on the complementary DNA strand? will be the bases on the complementary NA strand? 5. Part of the DNA molecule shown above is starting to unwind. What two cellular activities could this be thestartof? Copyflght 01985 by D.C. Head and Company 12 Cd; Table 34—1. SlmiIarttI and Diffran S.tw..n DNA and RNA RNA DNA . Ri pint Deoxynlxse present Phospbonc acid present Ademne — The pres Uracil present GaI2rnne jxeseut cprent -. De •—- Single s*xand i c 4 Ee i in nidei 4 Moves out aE nucIe 4