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1953年Crick和Watson揭示了遗传物质（)结构，极大促进了现代生物技术的发展。
A.RNA
B.DNA
C.mRNA
D.蛋白质
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题目内容
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题目内容
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A.RNA
B.DNA
C.mRNA
D.蛋白质
如果结果不匹配，请 联系老师 获取答案
更多“1953年Crick和Watson揭示了遗传物质()结构，…”相关的问题
下面关于Watson—Crick DNA双螺旋结构模型的叙述中哪一项是正确的？()
A．两条单链的走向是反平行的
B．碱基A和G配对
C．碱基之间共价结合
D．磷酸戊糖主链位于双螺旋内侧
根据Watson—Crick DNA双螺旋模型计算： (1)相对分子质量为3×107的双股DNA分子长度是多少厘米？ (2)这个DNA分子的体积是多少立方厘米？ (3)这个DNA双螺旋有多少螺圈？
下列哪一项是生物化学发展史上的重要事件
A．1926年Sumner J．B．首次成功分离结晶脲酶，并证明酶是蛋白质
B．1933年和1937年Krebs H．A相继发现了鸟氨酸循环和三羧酸循环
C．1953年Watson and Crick提出了DNA 螺旋结构的分子模型
D．1986年Mullis建立了体外扩增DNA的技术——PCR技术
E．以上都是
下列哪一项事件是生物化学进入分子生物学时代的重要标志
A．1944年Macleod和Carty进行的肺炎双球菌体外转化实验
B．1953年Watson和Crick提出的DNA 螺旋结构模型
C．1973年Berg和Boyer等建立的DNA重组技术
D．1983年Mullis K等建立的体外扩增DNA(PCR)的技术
E．2003年以美国为首的世界六个国家联合宣布人类基因序列图
It has also provided the basis for the traditional methodology of science. It includes objective observation, description of some phenomena, the statements of hypotheses (假说) about the events observed and possible relationships among them, the use of these to predict future events, the evidence of the hypotheses and the construction of a theory based on the evidence of the hypotheses.
But the classic "scientific method" has been criticized from a variety of points. To begin with, it is obvious that the "objectivity" of science strictly characterizes only the lowest order of scientific activity— observation. Even here it is doubtful whether anyone can be a truly impartial observer of events.
What someone chooses to observe and the way one observes it must, after all, in part be a reflection of experience and of ideas as to what is important. Consider, for example, the different ways in which an artist and a layman look at a painting and the different reactions they have to the same work. The construction of hypotheses and theories reflects the scientist's interpretation of what he or she has observed even more clearly than observation. At this stage of the scientific method, an element of subjectivity is inevitably present. This can most easily be seen in the extreme case of scientists of truly creative genius. Galileo, for example, challenged the scientists of his day with his hypothesis that the earth revolved around the sun. A twentieth century example is Watson and Crick's discovery of the molecular structure of DNA. Obviously, science may involve not only careful observation but also a willingness to be creative.
Human beings differ from animals because they can
A．adapt to their environment.
B．control their environment.
C．adapt the environment to their need.
D．observe and understand their environment.
发现核酶(ribozyme)的学者是()。
A．Jacob & Monod
B．Wilmut & Pauling
C．Watson & Crick
D．Cech & Altman
