The enzyme that laboratory usually use to link exogenous DNA and vector DNA is ( )
A. DNA polymeraseⅠ
B. DNA polymeraseⅡ
C. DNA polymerase Ⅲ
DNA ligase
E. reverse transcriptase
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The product of gene expression is ( )
A. DNA
B. RNA
C. protein
D. most are protein, some are RNA
E. enzyme and DNA
The constitutive gene expression ( )
A. when there is inducer, expression will be higher
B. when there is inducer, expression will be lower
C. when there is repressor, expression will be higher
D. when there is repressor, expression will be lower
E. inducer and repressor have little effect on the expression
Most of the gene expression occur in the ( )
A. replication level
B. transcription level
C. transcription initiation
D. translation level
E. post-translational level
Cis-acting element is ( )
A. TATA box and CCAAT box
B. DNA sequences that have regulatory function
C. 5′flanking sequence
D. 3′flanking sequence
E. non-coding sequence
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