Which of the following description is NOT correct about the behavior of post-transcriptional mRNA in eukaryotic cells?()
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.
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Which of the following description is NOT correct about the function of the 5’ cap of mRNA in eukaryotic cells?()
A. To protect mRNA and prevent it from degradation
B. To promote the translation of mRNA
C. To regulate the expression of mRNA from the promoter
D. To help mRNA to transfer out of the nuclear
Please give the correct order for the following steps of RNA capping process:①7’-methylation of guanosine.②Removal the last phosphate at 5’ terminal of pre-mRNA③The GMP cap is added to the pre-mRNA④The second nucleotide is methylated()
A. 1,2,3,4
B. 2,3,1,4
C. 1,4,3,2
D. 2,4,1,3
E. 4,3,2,1
The enzyme that catalyze the generation of poly A tail in mRNA 3 ' terminal is:()
A. Restriction enzyme
B. Guanylyl transferase
C. RNase P
D. RNA polymerase II
E. poly(A) polymerase
Which of the following description is NOT correct about the post-transcriptional processing of mRNA:()
A. The m7GpppNmp cap should be added to the 5’ end of precursor mRNA.
B. The splicing process is needed for precursor mRNA.
C. The poly(U) tail should be added on the 3’ end of precursor mRNA.
D. The mRNA precursor can be methylated in higher organisms.
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