Whichone is the essential amino acid?()
A. glycine
B. methionine
C. tyrosine
D. Glutamine
Whichdeaminationisthe main form in living organism?()
A. transamination
B. oxidative deamination
C. coupled deamination
D. direct deamination
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