Q. Intron transcripts in heterogenous nuclear are removed and exon transcripts are joined together under the direction of protein complexes. These complexes are

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Solution:

Immature mRNA that is hnRNA have introns that are intervening sequences. This introns should be removed during conversion of hnRNA to mRNA. This are removed with the help of spiceosome complexes that help in removal of introns and thereby join exons in direction of introns removal. This whole process is known as splicing.