The first found viral oncogene is ( )
A. ras
B. sis
C. myb
D. src
E. myc
查看答案
which is the correct about the description of cellular oncogene ( )
A. existent in the genome of normal cell
B. existent in the DNA virus
C. existent in the RNA virus
D. Is also called viral oncogene
E. The oncogene of normal cell may lead to the formation of tumor
Many plasmid vector used in gene engineering have the resistance gene of antibiotics, it is convenient for ( )
A. exogenous gene be inserted into plasmid
B. biology reproduction of host bacteria
C. transformation of plasmid
D. expression of target gene
E. screen the host bacteria harboring target gene
which is wrong about the description of PCR ( )
A. is an enzymatic -reaction
B. specificity of PCR amplification is determined by primer
C. amplification object is DNA sequence
D. amplification object is amino acid sequence
E. Taq DNA pol is needed
which does easily appear in PCR technology ()
A. false-negative result
B. false-positive result
C. lower sensitivity
D. not widely be applied
E. operation complicate
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