The alternative splicing of pre-mRNAs could produce same mRNAs.()

A. Methylation of bases after transcription
B. Deamination of bases after transcription
C. Splicing of the transcription product
D. Insertion or deletion of nucleotides after transcription

A. The mechanism of alternative splicing is quite different from constitutive splicing.
B. Isoproteins can be produced from one gene.
C. Alternative splicing have different 5’ and 3’ splicing sites.
Different proteins can be produced in different tissues and different development stages.
E. It could be across exons, or involved in variable exons and retained introns

A. belongs to a protein family that have one or more arginine and serine-rich region
B. inhibit the identification and splicing of splicesome by binding to the splicing site of the intron
C. is a kind of activator of splicing.
D. is often binding to the splicing enhancer sequences of the intron.

A. mRNA is combined with several proteins all the time after its transcription.
B. Mature mRNA is not combined with proteins, and is transferred across the nucleopore with its 5’ cap.
C. The splicing of pre-mRNA may be tissue-specific.
D. Isoproteins could be produced by RNA alternative splicing and RNA editing.