one can separate the parental DNA strands?
A: DnaC
B: DNA-pol
C: topoisomerase
D: primase
E: helicase
举一反三
- Topoisomerase II catalyzes the transient breaking and rejoining of two strands of duplex DNA which allows the strands to pass through one another, thus altering the topology of DNA.
- Which<br/>of the following statement about DNA polymerase of eukaryotes is NOT<br/>true:() A: DNA<br/>pol α/primase are involved in initial synthesis of the nascent<br/>strand. B: DNA<br/>polδ and ε are mainly responsible for the synthesis of<br/>DNA chains. C: Replacement<br/>of DNA polymerase could happen during DNA synthesis process. D: There<br/>are five kinds of DNA pol:α、β、γ、δ<br/>and ε in eukaryotes
- Which of the following statement about DNA polymerase of eukaryotes is NOT true: A: DNA pol α/primase are involved in initial synthesis of the nascent strand. B: DNA polδ and ε are mainly responsible for the synthesis of DNA chains. C: Replacement of DNA polymerase could happen during DNA synthesis process. D: There are five kinds of DNA pol：α、β、γ、δ and ε in eukaryotes
- The<br/>enzyme closely related to the synthesis of RNA primer is:() A: DNA<br/>pol α; B: DNA<br/>pol γ; C: DNA<br/>pol δ; D: DNA<br/>pol I; E: DNA<br/>pol III
- 在原核生物DNA复制延长中起主要催化作用的酶是(<br/>) A: DNA<br/>polⅠ B: DNA<br/>polⅢ C: DNA<br/>polⅡ D: DNA连接酶 E: 引物酶
内容
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在原核生物DNA复制延长中起主要催化作用的酶是() A: DNA<br/>polⅠ B: DNA<br/>polⅢ C: DNA<br/>polⅡ D: DNA连接酶 E: 引物酶
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RNA polymerase: () A: binds tightly to a region of DNA thousands of base pairs away from<br/>the DNA to be transcribed. B: can synthesize RNA chains without a primer. C: has a subunit called λ (lambda), which acts as a proofreading<br/>ribonuclease. D: separates DNA strands throughout a long region of DNA (up to<br/>thousands of base pairs), then copies one of them. E: synthesizes RNA chains in the 3' →direction.
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具有3′→5’外切酶活性的有（ ） A: DNA-pol α B: DNA-pol I C: DNA- pol Ⅱ D: DNA-pol lll E: DNA连接酶
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参与线粒体内DNA复制的DNA聚合酶是: A: DNA pol α B: DNA pol β C: DNA pol γ D: DNA pol δ E: DNA pol ε
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真核生物DNA聚合酶中不具有3'→5'核酸外切酶活性的是: A: DNA pol δ B: DNA pol Ⅱ C: DNA pol γ D: DNA pol ε E: DNA pol α和β