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Which of the following takes place when tryptophan levels are low?

Which of the following takes place when tryptophan levels are low? Correct Answer Ribosomes pauses at the Try codons in sequence 1

a, b and d take place when tryptophan levels are high.

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The expression of the tryptophan operon is independent of the availability of tryptophan in culture media.
Which of the following takes place when tryptophan levels are high?
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1. When evaporation takes place, cooling takes place.
2. Evaporation takes place at all temperature, boiling takes place only at the boiling point.
3. Evaporation is a surface phenomenon.
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In the context of the planning era i.e. 1951 to 2011, take into consideration the following statements : a. Food production increases fourfold, diversified industrial growth takes place. b. Import substitution, diversified export promotion and science and technical educational expansion takes place. c. Achievement in reducing poverty and unemployment ratio. d. Reduction in the concentration of economic power, decentralization of income and wealth takes place. Which of the above statements are true?