複選題50. Which one of the following statements as to TATA box is RIGHT? (A) A six-nucleotide-pair A+T-rich sequence about 35 nucleotides upstream of the transcription start site in bacterial promotcrs (B) It is usually iocated 10-15 bp upstream from the transcription start site in mammalian genes (C) The human TATA box is bound by the 34 kDa TATA-binding protein, a subunit in TFIID (D) All eukaryotic mRNA-encoding genes possess a consensus TATA box (E)All are right