Prokaryotic Transcription Process
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Questions and Answers

Where does transcription occur in prokaryotes?

  • Nucleus
  • Cytoplasm (correct)
  • Mitochondria
  • Nucleolus

    • What is the direction of RNA synthesis during transcription in prokaryotes?

  • 5'-3' (correct)
  • 3'-5'
  • 5'-5'
  • 3'-3'

    • What is the function of the promoter site in prokaryotic transcription?

  • Unwinds the DNA strand and initiates transcription (correct)
  • Unwinds the DNA strand and terminates transcription
  • Winds the DNA strand and terminates transcription
  • Winds the DNA strand and initiates transcription

    • What is the role of the 3'-OH group of the growing RNA chain during transcription?

    <p>Interacts with the α phosphate group of the incoming nucleotide to form a phosphodiester bond</p> Signup and view all the answers

    What triggers the termination of transcription in prokaryotes?

    <p>When the RNA polymerase detects a termination sequence</p> Signup and view all the answers

    What is the purpose of the promoter sequence during transcription in prokaryotes?

    <p>To unwind the DNA strand and initiate transcription</p> Signup and view all the answers

    What is the template for RNA synthesis during transcription in prokaryotes?

    <p>The antisense strand of DNA</p> Signup and view all the answers

    What type of bond is formed between the incoming nucleotide and the growing RNA chain during transcription?

    <p>Phosphodiester bond</p> Signup and view all the answers

    What happens to the RNA polymerase when it detects a termination sequence on the DNA?

    <p>It stops transcription and releases the RNA transcript</p> Signup and view all the answers

    What is the main enzyme responsible for transcription in prokaryotes?

    <p>RNA polymerase</p> Signup and view all the answers

    Study Notes

    Transcription in Prokaryotes

    • Transcription occurs in the cytoplasm in prokaryotes
    • The process of transcription consists of three phases: initiation, elongation, and termination

    Initiation Phase

    • RNA polymerase recognizes a promoter site on the DNA strand during initiation
    • The promoter sequence is read, unwinding the DNA strand and initiating transcription
    • The core enzyme of RNA polymerase then proceeds to synthesize RNA in the 5'-3' direction

    RNA Synthesis

    • The antisense strand of DNA is used as the template for RNA synthesis
    • The 3'-OH group of the growing RNA chain interacts with the α phosphate group of the incoming nucleotide to form a phosphodiester bond

    Termination Phase

    • Transcription occurs until a termination sequence on the DNA is found
    • When the RNA polymerase detects a termination sequence, it stops the transcription process
    • The synthesized RNA transcript is released, and the RNA polymerase dissociates from the DNA

    Transcription in Prokaryotes

    • Transcription occurs in the cytoplasm in prokaryotes
    • The process of transcription consists of three phases: initiation, elongation, and termination

    Initiation Phase

    • RNA polymerase recognizes a promoter site on the DNA strand during initiation
    • The promoter sequence is read, unwinding the DNA strand and initiating transcription
    • The core enzyme of RNA polymerase then proceeds to synthesize RNA in the 5'-3' direction

    RNA Synthesis

    • The antisense strand of DNA is used as the template for RNA synthesis
    • The 3'-OH group of the growing RNA chain interacts with the α phosphate group of the incoming nucleotide to form a phosphodiester bond

    Termination Phase

    • Transcription occurs until a termination sequence on the DNA is found
    • When the RNA polymerase detects a termination sequence, it stops the transcription process
    • The synthesized RNA transcript is released, and the RNA polymerase dissociates from the DNA

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    Description

    This quiz covers the process of transcription in prokaryotes, including the three phases of initiation, elongation, and termination, and the role of RNA polymerase.

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