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12. DNA looks like a twisted ladder. The SidesOf the ladder are composed of ___________ and ________. The Rungs of the ladder are made of the _________ and the _________ bonds that hold them together.
13. _______________ is the loose, uncoiled form of DNA. _________________ are the condensed, coiled form of DNA. How many chromosomes does a human DNA condense to form? _______
