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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.
A student claimed that polycarbonate is more dense than PA-6. Do the results of Experiments 1-3 support his claim？
A. No, because in Liquid 8, polycarbonate stayed at the bottom and PA-6 rose.
B. Yes, because in Liquid 8, polycarbonate stayed at the bottom and PA-6 rose.
C. No, because in Liquid 8, polycarbonate rose and PA-6 stayed at the bottom.
D. Yes, because in Liquid 8, polycarbonate rose and PA-6 stayed at the bottom.
临床上使用洋地黄制剂时，对伴肝功能障碍的心功能不全患者宜选用地高辛，对伴肾功能严重不良的心功能不全患者宜选用洋地黄毒苷。()
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