Multiple Choice
How can a single gene encode more than one polypeptide during transcription?
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15. Gene Expression
Introduction to Transcription
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
During transcription, what event occurs during the elongation phase?
A
The RNA transcript is spliced to remove introns.
B
RNA polymerase adds nucleotides to the growing RNA strand.
C
The DNA double helix is unwound by helicase.
D
Ribosomes assemble amino acids into a polypeptide chain.
Verified step by step guidance1
Understand the process of transcription, which is the synthesis of RNA from a DNA template. It involves three main phases: initiation, elongation, and termination.
Focus on the elongation phase of transcription. During this phase, RNA polymerase is the key enzyme responsible for synthesizing the RNA strand.
RNA polymerase moves along the DNA template strand, adding complementary RNA nucleotides to the growing RNA strand. This is a continuous process where nucleotides are added one by one.
Recognize that the elongation phase does not involve splicing of introns or the unwinding of the DNA double helix by helicase. Splicing occurs after transcription, and helicase activity is primarily associated with DNA replication.
Note that ribosomes assembling amino acids into a polypeptide chain is part of translation, not transcription. Translation is the process where the RNA transcript is used to synthesize proteins.
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