Question

QUESTION 2 Match the term with its function B. - 5'cap E poly-A tail D. SnRNP A self-splicing intron B. Guides mRNA to ribosomes and protects it from exonuclease activity C. Structure in which introns are spliced out of hn RNA D. small nuclear RNA-protein complexes, involved in intron removal E. Necessary for RNA export from the nucleus A spliceosome C. group I intron

Answer 1

5' cap-  (B) Guides mRna to ribosomes and protects it from exonuclease activity.

Poly A tail -(E) Necessary for Rna export from the nucleus.

This helps in export as well as protection from other enzymes in nucleus as well as cytoplasm.

snRNP- ( D) small nuclear Rna + protein complexes, involved in intron removal.

​​​​they make up the splicesomal complex and help in different function during the removal.They are also known as snurps which are made up of Rna- protein complex.

splicesome- ( C) structure in which introns are spliced out of hnRNA

​​​​this is the structure that is formed during splicing which helps in removal of introns.Splicesome is a supramolecular assembly of Rna and proteins that helps in splicing and also is seen in group 3rd class of introns.

Group I intron - (A) self splicing introns.

these are the class of self splicing introns found in nuclear, mitochondrial and chloroplast genes of rRna, mrna and trna respectively. These introns are also found in some rare class of bacteria which donot require ATP enzymes.