Question
Part of eukaryotic DNA contributing to polypeptide synthesis:
A. Exon
B. Enhancer
C. Leader sequence
D. a and b both
Show Answer
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Correct Answer » D
Explanation
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Most eukaryotic genes have alternating exons and introns. In this example, there are nine exons (blue-colored areas) and eight introns (green-colored areas). The introns are removed from the primary transcript by processing reactions, and the exons are ligated together in sequence to form the mature mRNA through a process termed RNA splicing.
The processing of the primary transcript, which involves the precise removal of introns and the splicing of adjacent exons.
