Which is not true about palindrome structure ( )
A. recognition sequence of the restriction endonuclease
B. recognition sequence of some protein
C. side sequence of the gene
D. high repetitive sequence
E. have axis of symmetry
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which is not the mechanism of oncogene activation ( )
A. point mutation
B. chromosome translocation
C. gene amplification
D. insertion of pre-virus
E. above is wrong
The first found viral oncogene is ( )
A. ras
B. sis
C. myb
D. src
E. myc
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
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