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文献传递服务是图书馆利用本馆和外馆文献资源帮助读者获取原始文献的服务。()

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According to the passage, a similarity between DNA and proteins is that both types of molecules:

A. are found only in gametes.
B. are abundant in the cytoplasm.
C. contain 20 different amino acids.
D. are composed of smaller subunits.

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Pubmed提供“自动词汇匹配技术”，当一个未加任何限定的检索词输入检索框时，将按照：Mesh转换表、期刊转换表、短语表、作者索引、短语检索进行转换、匹配和检索。()

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According to the Protein Hypothesis, which of the following observations provides the strongest evidence that genes are NOT composed of DNA ？

A. DNA is composed of only 4 types of nucleotides.
B. DNA is composed of smaller subunits than are proteins.
C. DNA is abundant in both the nucleus and the cytoplasm.
D. The concentration of DNA is generally consistent from cell to cell.

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维生素C见光易变色所以要避光保存。()

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