Which of the following is not required for transcription?

Question

BlackTom AI · Accepted Answer

Let’s break down the components typically required for transcription and examine each option in turn.
Option 1: ribonucleotides. These are the building blocks of the RNA transcript. During transcription with RNA polymerase, ribonucleoside triphosphates (rNTPs) are incorporated into the growing RNA strand, so ribonucleotides are indeed required.
Option 2: DNA template. Transcription uses a DNA template strand to guide the sequence of the RNA being synthesized. Without a DNA template, transcription cannot proceed, so this is required.
Option 3: RNA primers. In transcription, there is no need for short RNA primers to start synthesis. Unlike DNA replication, RNA polymerases can initiate RNA synthesis de novo without a pre-existing primer. Therefore RNA primers are not required for transcription.
Option 4: RNA polymerase. The enzyme RNA polymerase is the molecular machine that catalyzes the formation of the RNA strand from the DNA template, so its presence is essential for transcription.
In summary, nucleotides (ribonucleotides), a DNA template, and the RNA polymerase enzyme are all necessary for transcription, whereas RNA primers are not required in this process.

Which of the following is not required for transcription?单项选择题

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