How many of these strains of E. coli would have no ß-galactosidase activity? a) I', o*, z*, Y* (no glucose, no lactose)b) I', o*, z*, Y* (no glucose, high lactose)c) I', o*, z*, Y* (high glucose, no lactose)d) 1', o*, z*, Y* (high glucose, high lactose)e) I', o*, z', Y* (no glucose, no lactose)f) I°, o*, z', Y* (high glucose, high lactose)g) 1', o", z*, Y- (high glucose, high lactose)h) I', o", z*, Y* (no glucose, no lactose)i) , o", z*, Y* (no glucose, high lactose)j) , o", z*, Y* (high glucose, no lactose)k) I', o", z*, Y* (high glucose, high lactose)I) 1,0*, z*, Y* (no glucose, no lactose)m)1, o°, z*, Y* (no glucose, high lactose)n) 1, 0*, z*, Y* (high glucose, no lactose)o) 1, 0*, z*, Y* (high glucose, high lactose)p) , o*, z*, Y* (no glucose, no lactose)q) 1`, o*, z*, Y* (no glucose, high lactose)r) , 0+, z*, Y* (high glucose, no lactose)s) i,0+, z*, Y* (high glucose, high lactose)

Grouping functionally relevant genes together is a method used by bacteria to manage gene expression. This means that they can be adjusted in tandem. Operons are a set of contiguous coordinately regulated genes. An operon's required genes are transcribed together to form a single mRNA known as a polycistronic message.Answer: The message originates from a single promoter and may be coordinated by regulating that promoter. Because the mRNA has several Ribosome binding sites, the protein can be generated separately from the polycistron.The lac Y-galactosidase permease operon permits the inducer lactose to enter the cell. Beta-galactosidase (LacZ) performs two functions: it cleaves galactoside bonds between Glu and Gal in the lactose molecule and it also isomerizes lactose to allolactose, which acts as an inducer. The lac repressor tetramer (product of the lacI gene) attaches to the operator region close to the operon's promoter. As a result, the Lac operon is suppressed in the absence of lactose. Lactose binds to the repressor, inducing a conformational shift and activation of the operon. Lac O - operator site is a unique sequence on DNA that allows Repressor protein tetramer to attach. In the presence of glucose, the Lac operon remains inactive. Because glucose is favored over lactose, if both are available, glucose is used first, followed by lactose. (Curve of diauxic growth) If both glucose and lactose are available, the lactose is taken up by the bacteria after the glucose is used up, and the operon is triggered later. No ß-galactosidase activity: Option (a) no enzyme activity since no lactose is present to trigger the operon. option (c) Catabolite repression blocks the operon when glucose levels are high. Option (e) (f) Because the lac Z gene is mutated in both instances, no activity is seen. option (g) Lac Y has been mutated such that lactose cannot enter the cell to trigger the operon. LacY mutants maintain the ability to produce beta-galactosidase, but this cannot be triggered by adding lactose to the medium. option (p) (q) (r) (s) - Is mutant is a super repressor protein that has been mutated to be insensitive to the inducer. It remains bound to the operator and does not depart. As a result, the operon is not active.