ppt模板藍(lán)色帆船主題(存儲版)
【正文】 ong 精美 PPT模板盡在如下豆單 ? ? 歡迎大家欣賞和下載 樣例文本 B ? The DNA double helix is stabilized primarily by two forces: hydrogen bonds between nucleotides and basestacking interactions among the aromatic nucleobases.[12] In the aqueous environment of the cell, the conjugated π bonds of nucleotide bases align perpendicular to the axis of the DNA molecule, minimizing their interaction with the solvation shell and therefore, the Gibbs free energy. The four bases found in DNA are adenine (abbreviated A), cytosine (C), guanine (G) and thymine (T). These four bases are attached to the sugar/phosphate to form the plete nucleotide, as shown for adenosine monophosphate. ? The nucleobases are classified into two types: the purines, A and G, being fused five and sixmembered heterocyclic pounds, and the pyrimidines, the sixmembered rings C and T.[8] A fifth pyrimidine nucleobase, uracil (U), usually takes the place of thymine in RNA and differs from thymine by lack
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