Which one is correct to say that the 3 'terminal poly-A sequence of mRNA synthesized in the nucleus?()
A. It can be added after any noncoding sequence at the 3 'end of pre-mRNA
B. The same phenomenon can be found in rRNA and tRNA
C. The transcriptional poly-T sequence of template chain
D. Transcription from RNA polymerase II
E. Added after pre-mRNA 3 'end shearing
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What about inserting a base into the coding region of a gene?()
A. No impact
B. It will change all amino acid sequences of the protein downstream of the insertion point
C. Depending on the insertion point, it may have different effects on the protein
D. An amino acid will be inserted into the protein sequence
E. Three amino acids will be inserted into the protein sequence
Which of the following is not the difference between DNA polymerase and RNA polymerase?()
A. The fidelity of the two enzymes is different when the template chain is copied
B. The number of reaction starting sites is different
C. Different reading directions of template chain
D. Size of reaction products
E. The reaction process is bidirectional
What will be caused by swing pairing during translation?()
A. There are less than 61 kinds of tRNA
B. Produce code shifting mutation, destroy the synthesis of protein
C. Many different amino acids may be synthesized at a specific location of the protein
D. tRNA can be released at the E site of ribosome
E. Sometimes the P site of tRNA can be inserted into ribosome
How can a eukaryotic transcription product express more than one protein?()
A. No, only prokaryotes can do that
B. It can contain more than one ribosome binding site
C. It can contain operons with multiple structural genes
D. Its translation can be coupled with the transcription process
E. Different exons can be spliced during transcription splicing
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