Which of the Following Statements About Regulation of the Trp

question 86

Multiple Choice

Which of the following statements about regulation of the trp operon are true? When the Trp concentration in the cell is very low, 1. ribosomes stall at Trp codons in the attenuator. 2. RNA polymerase terminates transcription of the trp operon prematurely. 3. the secondary structure of the RNA transcribed from the leader region changes. 4. enzymes which catalyze the synthesis of Trp are made in greater abundance.

• A) only 1, 2 and 3 are true
• B) only 2, 3 and 4 are true
• C) only 1, 3 and 4 are true
• D) only 1 and 3 are true
• E) all are true

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