The synthesis of messenger RNA encoding eukaryotic ribosomal protein occurs in()
A. cytoplasm
B. Nuclear membrane
C. nucleolus
D. euchromatin
E. heterochromatin
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How do amino acids recognize specific codons?()
A. Hydrogen bonding between amino acids and codons
B. It depends on the hydrogen bond between amino acids and the anticodon on tRNA
C. Ribosomes can exclude amino acids that are not correctly matched
D. The specific recognition between Amino acid which is dependent on aminoacyl tRNA synthetase with tRNA specific recognition
E. Transcription initiation factor recognizes - 10 and - 35 sites
The proportion of four bases in the DNA of phage X174 was 25% A, 33% T, 24% G, 18% C, respectively.The correct explanation for this phenomenon is:()
A. In the viral genome,the base pairing does not follow the classic Watson Crick principle,but G-A pairing and C-T pairing
B. In the viral genome,the base pairing does not follow the classic Watson Crick principle,but G-T pairing and C-A pairing
C. The viral genome is linear, allowing for base mismatches
D. The nucleic acid and nucleic acid binding protein of the virus form a close complex, so the base cannot be paired with other bases
E. The genome of phage X174 is single stranded
Which of the following mRNA molecules can form the most stable stem ring structure()
A. 5’....GGCUU.........UUCGG......3’
B. 5’....GGCUU.........AAGCC.......3’
C. 5’....GGCUU.........GGCUU......3’
D. 5’....GGCUU.........CCGAA.......3’
E. 5’....AAGCC.........AAGCC......3’
Gene silencing mutations can lead to()
A. The nucleotide sequence of mRNA encoded by this gene did not change
B. The amino acid sequence of the protein encoded by the gene does not change
C. The protein encoded by this gene will not be expressed
D. An amino acid in the protein encoded by the gene will be replaced by another amino acid,but it will not change the function of the protein
E. Transposition of transcription reading frame
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