During transcription, in which direction is the mRNA synthesized?

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Study for the Campbell Biology Concepts and Connections Test. Explore flashcards and multiple-choice questions, complete with hints and explanations. Prepare for your success!

Multiple Choice

During transcription, in which direction is the mRNA synthesized?

Explanation:
During transcription, the RNA strand is built in the 5' to 3' direction. RNA polymerase adds ribonucleotides to the 3' end of the growing chain, reading the DNA template strand in the 3' to 5' direction. This setup means the mRNA sequence alignment mirrors the DNA coding strand (with U replacing T). The key point is that bond formation and nucleotide addition occur at the 3' end, forcing synthesis to proceed from 5' toward 3'.

During transcription, the RNA strand is built in the 5' to 3' direction. RNA polymerase adds ribonucleotides to the 3' end of the growing chain, reading the DNA template strand in the 3' to 5' direction. This setup means the mRNA sequence alignment mirrors the DNA coding strand (with U replacing T). The key point is that bond formation and nucleotide addition occur at the 3' end, forcing synthesis to proceed from 5' toward 3'.

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