Which of the following is true about lactose operon?()
A. Induced by glucose, inhibited by lactose
B. Induced by lactose and inhibited by cAMP
C. Regulated positively by cAMP and negatively by glucose
D. Regulated positively by lactose and negatively by glucose
E. Induced by lactose and cAMP at the same time
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In what combination is lactose turned on?()
A. operatorgene
B. Repressor protein
C. Promoter
D. mRNA
To clone the green fluorescent protein gene downstream of the promoter of proP,what is the purpose of this?()
A. It causes the mutation of proP gene
B. Inducing the transcription of proP gene
Construction of gene library containing green fluorescent protein
D. Green fluorescent protein as a reporter gene to report the promoter activity of proP gene
E. The first step of cloning proP gene into other host cells
What is the function of aminoacyl tRNA synthetase?()
A. Perform transpeptidyl reaction
B. Help tRNA find the A site of ribosome
C. Binding to ribosome binding site sequence of tRNA
D. Transcription of tRNA gene
E. Attaching amino acids to specific tRNA
When using bacteria to express mammalian proteins, cDNA is more commonly used than genomic DNA.Which of the following is the most appropriate explanation?()
A. Similar sized cDNA is easier to clone than genomic DNA
B. It is easier to clone RNA than DNA.
C. It's impossible to clone the whole gene coding region
D. Most eukaryotic genes contain introns, which cannot be removed in bacteria
E. Most eukaryotic promoters don't work in bacteria
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