A) Code for functional domains in proteins.
B) Are removed from pre-mRNA by spliceosomes.
C) Allow one gene to make different gene products depending on which introns are removed during splicing
D) Both [b] and [c]
Correct Answer: D
Solution :
[d] Introns are removed by spliceosomes, and differential splicing can produce different gene products as seen in the tropomyosin example. The DNA loops containing introns, seen in hybridization experiments were done with DNA and mature messenger RNA, not pre-mRNA.
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