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The passage is primarily concerned with______ [br] It can be inferred from the p
The passage is primarily concerned with______ [br] It can be inferred from the p
游客
2025-02-26
22
管理
问题
The passage is primarily concerned with______ [br] 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?
选项
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
D、The molecular sequences in eukaryotic RNA, true bacterial RNA, and archaebacterial RNA
E、The amino acid sequences in enzymes of various eukaryotic species and those of enzymes in archaebecterial species
答案
D
解析
This question requires you to identify information implied rather than stated in the passage. D, the best answer, can be inferred from lines 30-31, which state that it “now appears that there are three stems in the tree of life”-that is, three categories of organism-because “new techniques for determining the molecular sequence of the RNA of organisms have produced evolutionary information…” From this it can be inferred, as D states, that researchers compared the molecular sequences in the RNA of each kind of organism postulated by the new view-eukaryotic, bacteria, and archaebateria. The other choices cannot be inferred from the passage; each describes types of features discussed in the context of earlier, not later, research.
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