C。解析:沃森和克里克发现DNA的双螺旋结构主要是基于分析其他科学家的数据以及他们自己的研究。选项A仅他们自己的实验室实验不准确,因为也参考了别人的数据;选项B仅理论计算不全面;选项D纯靠运气是错误的。本题考查对科学发现过程的理解,词汇有“double - helix(双螺旋)”“discovery(发现)”,语法为一般过去时的被动...
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启动子是RNA 聚合酶识别、结合和开始转录的一段DNA 序列。研究者认为，在启动子序列中形成的i-基元结构...
Many people believe that American biologist James Watson and English physicist Francis Crick discoveredDNAin the 1950s. In reality, this is not the case. Rather, DNA was first identified in the late 1860s by Swiss chemist Friedrich Miescher. Then, in the decades following Miescher's discovery, ...
CHAPTER 14 : DNA – THE MOLECULE OF HEREDITY 14 . 1 INTRODUCTION : How was the DNA double helix discovered ?Molecule, The
Shortly before an article appeared in Nature magazine about the discovery of DNA, Francis Crick commented to friends that he and Watson had discovered the “secret of life”. Research into this field had begun in the 19th Century with Austrian monk Gregory Mendel and developed for decades with ...
James Watson and Francis Crick: discovered the structure of DNA double helix in 1953 Watson, Crick and Wilkins received Nobel Prize in 1962 Franklin’s contribution has not been properly acknowledged The structure of DNA double helix DNA Replication ...
In biology, "double helix" is a term used to describe the structure ofDNA. A DNA double helix consists of two spiral chains of deoxyribonucleic acid. The shape is similar to that of a spiral staircase. DNA is anucleic acidcomposed of nitrogenous bases (adenine, cytosine, guanine, and thymi...
Shortly before an article appeared in Nature magazine about the discovery of DNA, Francis Crick commented to friends that he and Watson had discovered the 2、 “secret of life”. Research into this field had begun in the 19th Century with Austrian monk Gregory Mendel and developed for decades ...
(B-DNA), and there is a more recently discovered left-handed helix (Z-DNA). The DNA helix appears to be a dynamic structure comprising many different helical forms which may exist in equilibrium. The helical parameters that determine the overall shape of the double helix for different forms ...