Q. Removal of introns and joining the exons in a defined order in a transcription unit is called

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Solution:

In some eukaryotes, genes consist of coding nucleotides sequences, which are separate from each ther by blocks of non-coding sequences. The coding sequences here are called exons and non-coding sequences are called introns. The primary transcript from a typical eukaryotic gene contains introns as well as exons. The introns are removed from this primary transcript by a process called RNA splicing.