Split genes
A. are common in bacteria and eukaryotes.
B. have introns located only at the beginning and end of a coding region.
C. only have exons initially transcribed to mRNA.
D. are acted upon by spliceosomes to excise introns and then join exons.
Answer: D
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Fill in the blank(s) with the appropriate word(s).
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Which of the following is essential in PCR?
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