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发布时间：2006-06-23 17:04     点击：

　　(D) summarizing the differences in structure and function found among true bacteria, archaebacteria, and eukaryotes

　　(E) formulating a hypothesis about the mechanisms of evolution that resulted in the ancestors of the prokaryotes

　　2. According to the passage, investigations of eukaryotic and prokaryotic cells at the molecular level supported the conclusion that

　　(A) most eukaryotic organisms are unicellular

　　(B) complex cells have well-formed nuclei

　　(C) prokaryotes and cukaryotes form two fundamental categories

　　(D) subcellular structures are visible with a microscope

　　(E) prokaryotic and eukaryotic cells have similar enzymes

　　3. According to the passage, which of the following statements about the two-category hypothesis is likely to be true?

　　(A) It is promising because it explains the presence of true bacteria-like organisms such as organelles in eukaryotic cells.

　　(B) It is promising because it explains why eukaryotic cells, unlike prokaryotic cells, tend to form multicellular organisms.

　　(C) It is flawed because it fails to account for the great variety among eukaryotic organisms.

　　(D) It is flawed because it fails to account for the similarity between prokaryotes and eukaryotes.

　　(E) It is flawed because it fails to recognize an important distinction among prokaryotes.

　　4. It can be inferred from the passage that which of the following have recently been compared in order to clarify the fundamental classifications of living things?

　　(A) The genetic coding in true bacteria and that in other prokaryotes

　　(B) The organelle structures of archaebacteria, true bacteria, and eukaryotes

　　(C) The cellular structures of multicellular organisms and unicellular organisms

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