Multiple Choice
Which process produces an RNA copy of a DNA molecule?
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15. Gene Expression
Introduction to Transcription
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Which of the following elements is responsible for synthesizing RNA within the transcription bubble?
A
Ribosome
B
RNA polymerase
C
Helicase
D
DNA ligase
Verified step by step guidance1
Understand the process of transcription: Transcription is the synthesis of RNA from a DNA template. During this process, a transcription bubble forms where the DNA strands are temporarily separated to allow RNA synthesis.
Identify the role of RNA polymerase: RNA polymerase is the enzyme responsible for synthesizing RNA by reading the DNA template strand and assembling complementary RNA nucleotides.
Clarify the role of other elements: Helicase is involved in unwinding DNA during replication, not transcription. DNA ligase is responsible for joining DNA fragments during replication or repair, and the ribosome is involved in protein synthesis during translation, not RNA synthesis.
Focus on RNA polymerase within the transcription bubble: RNA polymerase binds to the DNA at the promoter region, separates the strands locally, and synthesizes RNA within the transcription bubble.
Conclude that RNA polymerase is the correct answer: RNA polymerase is the enzyme directly responsible for RNA synthesis during transcription, making it the correct choice for this question.
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