题干

愈伤组织细胞在一种包含所有必需物质的培养基中培养了几个小时,其中一种化合物
具有放射性(氚标记)。当这些细胞被固定后进行显微镜检,利用放射自显影发现放射
性集中于细胞核、线粒体、叶绿体和核糖体结构中。该标记化合物最可能是

A:丙氨酸

B:尿嘧啶核糖核苷酸

C:胸腺嘧啶脱氧核苷酸

D:葡萄糖

上一题 下一题 0.0难度 选择题 更新时间:2017-08-01 10:28:44

答案(点此获取答案解析)

C

同类题4

阅读理解

    It has been around for centuries, but up until very recently, traditional Chinese medicine (TCM) wasn't fully accepted abroad. The 2001 film Treatment(《刮痧》)tells the story of a Chinese man in the US who's charged with guasha, a form of TCM treatment, to cure his grandson's disease.

    During the last 10 years or so, however, TCM has been getting increasingly popular all over the world. A report says this style of health care, which includes different forms like herbal medicine and exercise, has spread to 183 countries and areas.

    "We have set up 10 TCM centers outside China, and all of them are popular among locals," said Wang Guoqiang at a news meeting on Dec 6. "Governments of 86 countries and areas have signed agreements with the Chinese government on TCM corporation(合作)."

    One of the reasons behind the growing popularity of TCM is the increase of scientific research into it. And after Tu Youyou-the Chinese scientist who discovered the anti-malaria(抗疟疾)drug qinghaosu(青蒿素)-won the Nobel Prize, TCM became even more famous all over the world.

    However, all these achievements in TCM don't mean that it's problem-free. Over the years,TCM has faced challenges in being able to prove that it has certain effects.

    Some researchers have suggested TCM should be more exact and work together with western medicine.

    "Bringing together with western medicine and TCM, rather than being in competition, is where the potential(潜力)for great effects is," said Bernhard Schwartlander,the China representative(代表)of the World Health Organization.