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All supplies or agents after autoclave sterilization can be used to extract RNA.()

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Which of the following is correct about the assembly of spliceosome.()

A. It is orderly accomplished step by step.
B. The base pairing between snRNPs is involved in the process.
C. Six snRNPs containing U1 to U6 are involved in the process.
D. The snRNPs in spliceosome are different in different stages.

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Which of the following is correct about the nucleotides at branch site:()

A. They will always be A
B. Their positons in introns are random.
C. Sequences near the branch site are conservative.
D. They initiate the first step of splicing by interacting with 3’ splicing site.
E. They will linked covalently with the three nucleotides in the intron after splicing.

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Protein synthesis proceeds from 5'→ 3' of mRNA, and the synthesis of peptide chain starts from the N terminal.()

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During the elongation process of translation, the amino acid carried by aminoacyl-tRNA will be transferred to the end of extended polypeptide chain carried by peptidyl-tRNA with the help of the large subunit of ribosome.()

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