aminoacyl-tRNA synthetase have specificity for: ()
A. amino acid only
B. tRNA only
C. amino acid and tRNA
D. GTP
E. ATP
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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
G protein is referred to: ()
A. PKA
B. guanylate cyclase
C. PKG
D. GRB2 binding protein
E. Guanylate binding protein
Which of the following play an important role in maintaining the structure of antiparallel β-pleated sheet? ()
A. hydrogen bond between the amino acid side chain
B. electrostatic attraction
C. disulfide bond
D. peptide bond
E. Vander Waa1s
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