7. What is the default status of lac operon, active or inactive gene expression?

Question

7. What is the default status of lac operon, active or inactive gene expression? What molecule and HOWcan it switch the status? What is the default status of trp operon? How tryptophan can switch the trpoperon?

8. Where in the cell are eukaryotic genomic DNAs located? What structure do DNA double-helices form via interaction with histone proteins?

9. What is the default expression status of genes packaged in eukaryotic chromosomes? How can chemical modification affect such status? What is called for inheritance such modifications from parent cells to daughter cells?

10. Which mammalian cells would undergo X chromosome inactivation, XX, XY, XXY, or XYY (more than one answer)? How does X chromosome inactivation impact the genes on that particular X chromosome? Why tortoiseshell cats are more likely to be females?

11. What proteins are needed to help initiate eukaryotic cell gene expression? What DNA segments can promote active gene expression?

12. What is an exon? What is an intron? Which of them will be in the mature mRNA sequence? What process is called for the removal of introns? How does this process contribute to the protein variance in different tissues or organs?

Explanation / Answer

7- lac operon is swtiched off inactive . When lactose bind to its repressor and prevent its binding to operator the lac operon swtiches on

Trp operon remain swtich on . Active . When tryptophan along with aporepressor bind form a complete repressor bind to operator to swtich off the operon.

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