13. DNA STRUCTURE Nucleotides Nucleotides are formed by the condensation of a pentose sugar, phosphate and one of the 4 bases The following illustration represents one nucleotide CIRCLE = Phosphate PENTAGON= Deoxyribose Rectangle= Base
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16. DNA STRUCTURE Antiparallel strands The strands run opposite of each other. The 5’ end always has the phosphate attached. ’
17. SAMPLE QUESTION Which of the following nucleotide base sequences complements the section of DNA modeled above? F. 5′UTCGCA3′ G. 5′TTAGCG3′ H. 5′GCGATT3′ J. 5′TTUCGC3′ 3′AATCGC 5′
18. SAMPLE QUESTION The Correct Answer: G G is the right answer because A (adenine) always pairs with T (thymine) and C (cytosine) always pair with (guanine).