consider the fec operon of Staphylococcus madeupiddis, which encodes an iron citrate uptake system. The fec operon promoter, called “Pfec”, is normally off when no regulators are bound to it (like the lac operon promoter). The activator FecA senses iron citrate and brings the appropriate enzyme to Pfec to start fec transcription when iron citrate levels are high. The repressor FecB senses free iron atoms and prevents fec transcription when free iron levels are high by binding to an operator between the promoter and structural genes. Considering the fec operon described above, which mutation would result in the operon being off under all conditions? Deletion of the operator where the repressor FecB binds to the DNA Deletion of the gene encoding the repressor FecB None of these mutations would result in the operon being off under all conditions Deletion of the gene encoding the activator FecA
Gene Interactions
When the expression of a single trait is influenced by two or more different non-allelic genes, it is termed as genetic interaction. According to Mendel's law of inheritance, each gene functions in its own way and does not depend on the function of another gene, i.e., a single gene controls each of seven characteristics considered, but the complex contribution of many different genes determine many traits of an organism.
Gene Expression
Gene expression is a process by which the instructions present in deoxyribonucleic acid (DNA) are converted into useful molecules such as proteins, and functional messenger ribonucleic (mRNA) molecules in the case of non-protein-coding genes.
consider the fec operon of Staphylococcus madeupiddis, which encodes an iron citrate uptake system. The fec operon promoter, called “Pfec”, is normally off when no regulators are bound to it (like the lac operon promoter). The activator FecA senses iron citrate and brings the appropriate enzyme to Pfec to start fec transcription when iron citrate levels are high. The repressor FecB senses free iron atoms and prevents fec transcription when free iron levels are high by binding to an operator between the promoter and structural genes. Considering the fec operon described above, which mutation would result in the operon being off under all conditions?
Deletion of the operator where the repressor FecB binds to the DNA
Deletion of the gene encoding the repressor FecB
None of these mutations would result in the operon being off under all conditions
Deletion of the gene encoding the activator FecA
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
