Textbook Question
Transcription ________.
a. Synthesizes new daughter DNA molecules from an existing DNA molecule
b. Results in the synthesis of an RNA copy of a gene
c. Pairs thymines (T) with adenines (A)
d. Occurs on ribosomes
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15. Gene Expression
Introduction to Transcription
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Which of the following events occurs during transcription?
A
Ribosomes assemble amino acids into a polypeptide chain.
B
RNA polymerase synthesizes RNA from a DNA template.
C
DNA helicase unwinds the DNA double helix for replication.
D
DNA ligase joins Okazaki fragments on the lagging strand.
Verified step by step guidance1
Understand the process of transcription: Transcription is the process by which a segment of DNA is used as a template to generate a complementary RNA strand.
Identify the key enzyme involved: RNA polymerase is the enzyme responsible for synthesizing RNA from the DNA template during transcription.
Differentiate transcription from other processes: Recognize that transcription is distinct from translation, where ribosomes assemble amino acids into a polypeptide chain, and from DNA replication, where DNA helicase and DNA ligase play roles.
Focus on the role of RNA polymerase: During transcription, RNA polymerase binds to the promoter region of the DNA and unwinds a small portion of the DNA double helix to access the template strand.
Synthesize RNA: RNA polymerase moves along the DNA template strand, adding complementary RNA nucleotides to build the RNA molecule, which is then processed to form mRNA, tRNA, or rRNA, depending on the gene being transcribed.
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