Question

26. Synthesis of a repressible enzyme is stopped by: a. the allosteric transition. b. the substrate binding to the repressor c. the corepressor (product) binding to the operator d. the corepressor-repressor (product-repressor) complex binding to the operator. e. the end-product binding to the promoter 27. Glucose effect or catabolite repression is an inhibition of the metabolism of alternative carbon sources by glucose Truel False 28. microRNA regulate gene expression on post-transcriptional level True False 29. A low rate of spontaneous mutations is beneficial in providing the genetic diversity needed for evolution Truel False 30. Organisms have mechanisms such as DNA repair to remove mutations Truel False 31. All of the following are mutagens except a. Nucleotide analogs b. lonizing radiation C. X rays d. UV radiation e. Photolyases 32.Genetic change in bacteria can be brought about by: a. Mutation b. Conjugation c. Transduction d. Transformation e. All of the above

Answer 1

Solution :

26 ) The repressible enzyme is an inhibitor which involves in stoppage of any enzyme which produces continously with the help of the excess of an inhibitor, the excess of inhibitor is corepressor and repressor.

Therefore the correct option is ( d ) , The corepressor and repressor complex binding to the operator.

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