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In a eukaryotic cell,a gene that is initially transcribed is 1500 nucleotides in length.The mature mRNA for the product is 1200 nucleotides in length.What is the most probable reason for the discrepancy?
A)a mutation that results in a shorter product
B)removal of introns
C)removal of exons
D)mRNA breakage
E)both choices A and D
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