Molecular biology khan academy9/4/2023 ![]() ![]() Transcription is completed when the RNA polymerase enzyme finds a triplet of bases read as a stop signal.The ribonucleoside triphosphate (NTPs) aligns along the antisense DNA strand by base pairing, then the RNA polymerase joins the ribonucleotides together forming a pre-messenger RNA molecule, complementary to a region on the antisense strand.mRNA that is transcribed is normally a copy of the sense strand, however, it is the antisense strand that is transcribed.this strand is known as the sense strand, while the complementary strand is known as the antisense strand. In transcription only one of the DNA strands is transcribed, the strand that has the initiator sequence.When transcription starts, DNA must unwind, aided by RNA polymerase, which catalyzes the process.When transcription comes to an end, the transcript is released from the polymerase, and the polymerase enzyme is also released from the DNAįigure: DNA Transcription Initiation.As each nucleoside triphosphate is added to the 3′ end of the growing strand, the two terminal phosphates are removed.The RNA synthesis takes place in the 5′-3′ direction. ![]() ![]()
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