• 2022-05-31
    Which
    one can separate the parental DNA strands?
    A: DnaC
    B: DNA-pol
    C: topoisomerase
    D: primase
    E: helicase
  • E

    内容

    • 0

      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

    • 1

      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.

    • 2

      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

    • 3

      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

    • 4

      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