第十四章单元测试
- The Meselson-Stahl experiment, in which they fully labelled DNA with heavy nitrogen (15N), and then allowed one round of replication with light nitrogen (N14) showed?:（ ）
- Double-strand DNA breaks are repaired by Nonhomologous End Joining. Put the temporal events of this process in the proper order:（ ）
①a complex including DNA-Protein Kinase catalytic subunits and the nuclease Artemis is next recruited
②The Ku70-Ku80 complex binds the free DNA ends
③Either of two DNA polymerases (Pol μ or Pol λ) subsequently extends the annealed DNA strands, as needed
④a complex consisting of XRCC4, XLF, and DNA ligase IV is next recruited.
五 Ligase seals the DNA breaks - DNA replication always proceeds in the 5’ to 3’ direction. （ ）
- DNA replication begins randomly in the genome. （ ）
- In meiosis biological process are you most likely to observe homologous/general recombination（ ）
A:The uni-directionality of DNA replication B:The semi-conservative nature of DNA replication C:The fully conservative nature of DNA replication D:The bi-directionality of DNA replication
答案:The semi-conservative nature of DNA replication
A:③-④-②-①-⑤ B:②-①-④-③-⑤ C:③-④-②-①-④ D:②-①-④-⑤-③
A:错 B:对
A:对 B:错
A:错 B:对
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