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DNA is a polymer, composed of monomeric units called nucleotides. Each nucleotide is composed of ribose (a five carbon sugar) on which are attached a phosphate group as well as one of four nucleobases: Adenine (A), Cytosine (C), Guanine (G) of Thymine (T). These four types of nucleotide monomers link up with one-another, through phosphate-sugar bonds, creating a single strand of DNA. The ordered sequence of these four types of nucleotides in strand encodes all the genetic information necessary for the organism to function. Nucleotides in a strand form strong complementary bonds with nucleotides from another strand, A with T and C with G. These bonds allow two strands of DNA to form the double-helix structure of DNA1 shown in Figure 1.1. The specificity of nucleotide bonds ensure that the two strands of the double helix are complementary and that the information contained in one strand can be recovered from the other. This ensures a certain structural stability to the DNA molecule and a way to recover the important information that could be lost due to a damaged strand.
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大幕才刚刚拉开，而终局将属于那些真正让AI扎根于物理世界的实干者。
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在回答如何守护好海南得天独厚的生态环境这一问题时，她讲述了一个年轻人的故事：“小莲前些年从大城市回到了七仙岭下的老家，把祖屋改造成一间小小的雨林民宿。她没砍一棵树，没动一块不该动的石头，只是把屋旁的山间小路收拾出来，变成了生态漫步道。”吕妍说，乡亲们越来越觉得，好生态就是“金饭碗”。，详情可参考官网
is the coordination mechanism: carriers spin down when it reaches