This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Molecular Genetics, Subject name: Biochemistry
Introns are exised by: 
Select and explain. 
A. RNA splicing, B. RNA editing, C. Restriction endonuclease, D. DNAase
A: RNA splicing
Answer: A: RNA splicing 
Explanation: Ans. A. RNA splicingRemoval of introns and joining of Exons called Splicing Intron:Intervening sequence that do not code for Amino AcidExonQ: Amino acid coding sequence.Molecular machinery that carry out splicing is called Spliceosome.SpliceosomesConsist of the primary transcript, five small nuclear RNAs (U1, U2, U4, U5, and U6) and more than 60 protein.Spliceosome = snRNA + RNP + hnRNA (or mRNA precursor).