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Antiparllel Double Helix. Double Helix Model - developed by Watson and Crick; DNA molecule made up of 2 connected chains of nucleotides forming a ladder-like structure. The structure of DNA was worked out in 1953 by James D. Watson and Francis Crick, who worked together in the Cavendish laboratory in Cambridge, England. The Structure of DNA (The Double Helix) DNA is made up of six smaller molecules -- a five carbon sugar called deoxyribose, a phosphate molecule and four different nitrogenous bases (adenine, thymine, cytosine and guanine). Organization of Protein Structure There are four levels of protein structure: primary, secondary, tertiary, and quaternary. These levels also reflect their temporal sequence. The structure of DNA and RNA. DNA is a double helix, while RNA is a single helix. Both have sets of nucleotides that contain genetic information.

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DNA and DNA Replication - Notes - Biology | Mrs. McComas DNA Spiral structure Ceiling Lights Vintage Home Lighting Luminaire Multiple Rod Wrought Iron Ceiling Lamp E27 Bulb Lamparas

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