题目内容

The sequence of tRNA 3' end is: ()

A. -CCA
B. -AAC
C. -CAA
D. -AAA
E. -UUU

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Which of the following could recognize the origin of transcription: ()

A. ρ factor
B. core enzyme
C. σ factor of RNA-pol
D. α subunit of RNA-pol
E. β subunit of RNA-pol

aminoacyl-tRNA synthetase have specificity for: ()

A. amino acid only
B. tRNA only
C. amino acid and tRNA
D. GTP
E. ATP

when protein biosynthesis, the activation site of amino acid is: ()

A. carboxyl group
B. amino group
C. alkyl group
D. hydrosulfide group
E. hydroxy group

cAMP could activite: ()

A. PKA
B. PKC
C. PKG
D. PTK
E. Ca2+- CaM kinase