Which of the following description is incorrect about spliceosome snRNP’s function?()
A. U1: pair with the 5 'splice site of mRNA precursor
B. U2: pair with conservative sequence near the branch point
C. U4: pair with the 3 'splice site of mRNA precursor
D. U5: interact with the last nucleotide of introns’ upstream exons and the first nucleotide of introns’ downstream exons
E. U6: combine with the 3 'splice site of introns and catalyze the transesterification
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Which of the following description is incorrect about introns in eukaryotic cells?()
A. Intron sequences code no functional product in eukaryotic cells
B. Parts of introns are with catalytic function
C. The average number of introns in the human genome is higher than in fruit flies and arabidopsis
D. The length of intron sequences in the human genome is greater than it of exon sequences
Which of the following description is correct about the splice sites?()
A. There are some long conservative sequences on the splice sites
B. 5 ' splice sites and 3' splice sites are complementary
C. Splicing sites are retained in the mature mRNA
D. The distance between 5 ' splice site and 3' splice site of the intron may be long
The common conservative sequences of splice sites on both sides of introns often are.()
A. 5’-GU,3’-AG
B. 5’-AG,3’-GU
C. 5’-GA,3’-UG
D. 5’-UG,3’-GA
Post-transcriptional mRNA molecules in eukaryotes must be processed, which involving the removal of (), and combination of coding region to become the protein translation template. And this process is called RNA splicing.()
A. exon
B. promotor
C. initiation factor
D. intron
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