Question

In split genes, the coding sequences are called as
A.Introns
B.Operons
C.Exons
D.Cistrons

Answer 1

Hint: After the process of transcription, primary transcript-heterogeneous RNA(hnRNA) is formed which undergoes a process of splicing to form three different types of RNA-rRNA,tRNA and mRNA.
Complete step by step answer:
-An exon can be defined as any nucleotide sequence that is encoded by a gene that remains present within the product of mature RNA. It is the genes that are present after the removal of introns by RNA splicing. The term exon includes both the DNA sequence that are present within a gene and the genes that correspond to the sequence in the RNA transcripts.
-Split genes can be described as those genes that consist of continuous coding sequences of nucleotides that are interrupted by intervening sequences.
Examples of split genes include eukaryotic genes and genes of some animal viruses.
-The continuous coding sequences are called exons and the intervening non-coding sequences are called introns.
-The exons are transcribed into RNA and from them proteins are produced by translation.
-The introns are the interrupting sequences of genes that do not code for any protein by translation.

So, the correct answer is option C. exons.

Note:
-Cistron can be referred to a gene that implies a specific behaviour in a cis-trans test which means that each gene is present on a specific locus in the genome.
-The operon is a cluster of genes that are regulated by the single promoter. It consists of operator genes and structural genes.