Considering the E.coli trp operon,which of the following is TRUE?
(I) The formation of the 2-3 hairpin is highly favored over the 1-2 hairpin when trp is low.
(II) When the concentration of Trp-tRNA^Trp is low,the ribosome halts on tandem Trp codon of segment 1.
(III) Formation of the 2-3 hairpin facilitates transcription and translation of the trp operon.
IV) The attenuator system has no effect when Trp levels are high.

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The Answer of Considering the E.coli trp operon,which of the following is TRUE? (I)The formation of the 2-3 hairpin is highly favored over the 1-2 hairpin when trp is low. (II)When the concentration of Trp-tRNA^Trp is low,the ribosome halts on tandem Trp codon of segment 1. (III)Formation of the 2-3 hairpin facilitates transcription and translation of the trp operon. IV)The attenuator system has no effect when Trp levels are high. A)I,II,III,IV B)I,II,III C)II,III D)II,III,IV E)II,IV