• 2022-06-09
    Which of the following statement about RNA polymerase in prokaryotes is correct:
    A: Holoenzyme is composed of five subunits (ααββ′σ)
    B: Any subunit of holoenzyme cannot bind to DNA separately in vivo
    C: Core enzyme consists of five subunits(ααββ′ω)
    D: σ factor helps RNA polymerase to recognize promoter
  • B,C,D

    内容

    • 0

      Which of the following statements about RNA polymerase II is wrong? A: It makes mRNA precursors B: It is strongly inhibited by a-amanitin C: It is composed of several subunits D: It has high frequency phosphorylation of the CTD in the maximum subunit<br/>during initiation

    • 1

      Which one of the following statements about E. coli RNA polymerase is false? A: the holoenzyme includes the sigma factor. B: the core enzyme includes the sigma factor. C: it requires Mg2+for its activity. D: it requires Zn2+for its activity.

    • 2

      Using the DNA template in a process called _______ RNA is synthesized utilizing which enzyme? A: translation, RNA polymerase B: transcription, DNA polymerase C: transcription, RNA polymerase D: replication, DNA polymerase

    • 3

      Which of the following descriptions about DNA and RNA polymerase are correct: A: RNA polymerase synthesize RNA chain using nucleoside diphosphate instead of nucleoside triphosphates. B: RNA polymerase can initiate transcription without a primer, and nucleotides are added to 5’ end of the growing RNA chain. C: RNA polymerase can add nucleotides in both 3’ or 5’ end of RNA chain. D: Both RNA polymerase and DNA polymerase can only add nucleotides to 3’ end of the polynucleotides.

    • 4

      Both eukaryotic RNA polymerase and prokaryotic RNA polymerase can directly recognize and bind to promoter.(<br/>)