Which is NOT true about RNA polymerases in eukaryotic cell:()
A. There are at least three RNA polymerases including I, II, III in eukaryotes.
B. RNA polymerase I has the highest transcriptional activity in eukaryotic cells
C. RNA polymerase I is located in the nucleolus, while RNA polymerase II, III are located in nucleoplasm
D. The RNA polymerase II is responsible for the transcription of rRNA genes
E. RNA polymerase III is responsible for the synthesis of precursors of the 5S rRNA, tRNA and other intracellular small RNAs
查看答案
In gene expression regulation of eukaryotes, which of the following regulatory element can inhibit the transcription:()
A. Enhancer
B. Silencer
C. Promoter
D. Upstream activation sequences
TrmB protein can bind to the promoter region of malE gene, and trehalose can bind to TrmB protein. In the presence of trehalose, the binding of TrmB protein to malE gene was inhibited, leading to the transcription of malE gene. So we can know that TrmB protein is a ()
A. Inducer
B. Positive control protein
C. Operon
D. Repressor
E. Repressor gene
Here is a mRNA of prokaryote. 5'-GGCGAACAUGGAGGCTAGAUGCACCCUUCGCAGUACGU-3'. The codons to be translated can be().
A. -AUG-ACG-CUU-CCC-ACG-UAG-CTA-
B. -AUG-GAG-GCT-AGA-UGC-ACC-CUU-CGC-AGU-ACG-
C. -AUG-UUC-GCC-
D. -CTA-GAU-GCA-CCC-UUC-GCA-GUA-CGU-
E. -AUG-CAC-CCU-UCG-CAG-UAC-
The content of which chemical element is usually constant in a nucleic acid: ____
A. C
B. O
C. N
D. H
E. P
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