Question

Types of introns, location and splicing mechanism?

Answer 1

​​​​​The whole genome of eukaryotes is divided into two parts, the coding sequences called as exons are the non coding sequences called as introns.

Less than 1% of the genome is coding in nature. It undergoes transcription and translation to form functional protein products.

Rest all the sequences which we call as introns is made up of repetitive sequences, centromere, telomere and includes DNA elements like promoter, operator, terminator, enhancer etc.

Type	Location	Splicing mechanism
1	rRNA, organellar RNA, few bacterial RNA	self splicing by transposase
2	chloroplast, mitochondrial, prokaryotes	self splicing by reverse transcriptase and ribozyme
Nuclear	nucleus	splicing by spliceosome which includes snRNA
Transfer RNA	tRNA	enzymatic

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