题目内容

Whichdeaminationisthe main form in living organism?()

A. transamination
B. oxidative deamination
C. coupled deamination
D. direct deamination

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Deoxyribonucleotides are formed in ( ) level. ( )

A. phosphate
B. diphosphate
C. triphosphate
D. NADP+

Which factor of RNA polymerase recognizes the promoter region of transcription? ( )

A. αsubunit
B. ρfactor
C. σfactor
D. βsubunit

The holoenzyme of RNA polymerase inprokaryote include ( ).

A. α2ββ′
B. α2ββ′σ
C. αββ′
D. ααβ′

Each helical turn of a-helix includes ( ) amino acid residues.( )

A. 3.8
B. 5.4
C. 3.6
D. 5.2