a.) Introns are segments of _______ that do not provide instructions for building a _______ .
b.) When different sections of pre-mRNA are removed in response to cell signals, certain regions of DNA can produce different _______.
c.) The parts of the pre-mRNA that stay after specific segments are removed are _______ while the sections that do not remain in the mRNA are known as _______ .
d.) The _______ cap helps mRNA travel through the _______ and attach to a _______ .
e.) In the cytoplasm, enzymes called _______ break down mRNA by removing _______ from the _______ end, allowing the nucleotides to be _______ during a new round of transcription.