One of the great scientific discoveries was the structure of DNA. DNA is found in the ___ of living organisms. A. cells B. leaves C. roots D. stems 相关知识点: 试题来源: 解析 A。DNA 存在于生物体的细胞中。叶子、根和茎不是 DNA 主要存在的地方。反馈...
Knowing in a scientific context displays itself in the arguments given and the actions taken in actual scientific work. As a concrete example of such arguments and actions, James Watson's celebrated account of the discovery, by Francis Crick and himself, of the structure of DNA, the heredity ...
百度试题 结果1 题目In 1953, the famous structure of DNA was d. 相关知识点: 试题来源: 解析 1.discovered#iscovered 略反馈 收藏
a determination of the structure of DNA which, like the laser, required about 40 years before it became commonly known as the basis of genetic engineering. In today’s newspapers we read about genetic screening for common genetic abnormalities and how it is central to techniques in forensic...
(4) After a long day in the lab, Watson went to bed early. (5) The right structure of DNA is a spiral staircase. (1) 考查细节。根据文章第一段和最后一段可知帮助Watson的是他的实验室合作伙伴。 (2) 考查细节。根据He was working with a team of scientists in America可知他做这个研究是在...
A. Adenine and guanine B. Cytosine and thymine C. Adenine and thymine D. Guanine and cytosine 相关知识点: 试题来源: 解析 C、D。在 DNA 结构中,腺嘌呤(A)与胸腺嘧啶(T)配对,鸟嘌呤(G)与胞嘧啶(C)配对。A 选项腺嘌呤和鸟嘌呤不配对;B 选项胞嘧啶和胸腺嘧啶不配对。反馈 收藏 ...
The 1.9-Å-resolution crystal structure of the nucleosome core particle containing 147 DNA base pairs reveals the conformation of nucleosomal DNA with unprecedented accuracy. The DNA structure is remarkably different from that in oligonucleotides and non-histone protein–DNA complexes. The DNA base-pai...
31p NMR spectra were obtained from the A-form and B-form of DNA fibers as well as from poly (dA-dT)·poly (dA-dT) has two distinct geometries. In contrast, the A-form poly (dA-dT)·poly (dA-dT) has a single conformation. The orientation of the phosphodiester group relative to th...
关键词: n48140* --life sciences--radiation effects on biochemicals-- in animals n48520 --life sciences--radiation effects on animals--vertebrates dna-- biological radiation effects gamma radiation irradiation molecular weight photon beams rats spleen thymus 年份: 1973 ...
The role of DNA topology in holding sister chromatids together before anaphase was investigated by analyzing the structure of a small circular minichromosome in cell cycle (cdc) mutants of the yeast Saccharomyces cerevisiae. In the majority of cells arrested after S phase but before anaphase, sister...