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- Comparing the Mechanisms of Action of EF-Tu/EF-Ts and DnaK/ GrpE (Integrates with Chapter 30.) In what ways are the mechanisms of action of EF-Tu/EF-Ts and Dna K/GrpE similar? What mechanist ic functions do the ribosome A-site and DnaJ have in common?Protein expression: Given that we control the composition of the medium in which we grow our bacteria, are there any additional advantages of recombinant expression of proteins compared to using chemical synthesis?Regulation of Genes and Their products 1. Given the following genotypes, explain how the mutation (identified by a (-) superscript) wil affect E. coll grown in lactose medium. Will the lac operon be on or off? Will there be a complete set of gene products from the lac operon? What will be the implication of the missing gene product, if ever? Will the cell be able to survive in the lactose medium or not? a. I+p+o+z- y+ b. i- p+o+z+y+ c. i+p+o- z+y+ d. i+p- o+z+y+ 2. In terms of the trp operon, differentiate between two normal bacterial cultures, one grown in a medium supplied with tryptophan and the other medium without tryptophan. 3. Experiments show that mutations at gene E lead to non-repressible transcription of trp genes. Why?
- 88Sequential binding of RNA polymerase II-TFIIF complex, TFIIE, and TFIIH completes ___________________ formation. A.pre-initiation complexb.TF recognition elementc.pre-elongation complexD.TATA binding complex 89Which of the following is the GDP-GTP exchange protein?A.EF-Tub.none of the abovec.EF-TsD.EF-G 90RNA polymerase II has 14 subunits. YesornoWhich statements are true? Explain why or why not.1 In terms of the way it interacts with DNA, thehelix–loop–helix motif is more closely related to the leu-cine zipper motif than it is to the helix–turn–helix motif.2 Once cells have differentiated to their final spe-cialized forms, they never again alter expression of theirgenes.3 CG islands are thought to have arisen during evo-lution because they were associated with portions of thegenome that remained unmethylated in the germ line.4 In most differentiated tissues, daughter cells retaina memory of gene expression patterns that were presentin the parent cell through mechanisms that do not involvechanges in the sequence of their genomic DNA.Complementation and mapping analyse of Lac− mutants
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