Which of the following happens first?
a)introns are edited out of the premature dna.
b)rna ploymerase reaches a terminator region.
c)nucleotides are covalently linked together.
d) rna polymerase binds to a promoter region of dna.

  In transcription, the enzyme that makes the RNA transcript must bind to the promoter region of the DNA before it starts making an RNA transcript. RNA nucleotides will be covalently linked together as the RNA transcript is made. The RNA transcript (also known as pre-mRNA) will be completed when the RNA polymerase reaches the terminator region. After the RNA transcript is released from the RNA polymerase, it will undergo several steps of processing, one of which involves the removal of introns

The vascular system