You decide to focus first on Mutation 1 and Mutation 2. The F' plasmid appears to "rescue" mutant strain 1 by restoring wild-type inducible expression. The F' plasmid does not change the phenotype of mutant strain 2; there is still no expression of the lac operon. There are three possible mutations that could lead to lack of expression: a super-repressor (Is), a promoter mutation (P-) or a mutation in the lacZ gene (Z- ). To determine the effect of introducing a wild-type F' plasmid into a bacterial cell with each of these mutations, you draw out the three possible scenarios. Three possible partial diploids: (1) F' lac+/P- (2) F' lac+/Z- (3)F' lac+/I^S

a² + b²= c²

24² + 7² = c²

c= 25

20

step-by-step explanation:

the solution of the equation is 2.23 ⇒ answer b

step-by-step explanation:

* lets revise the meaning of exponential function

- the form of the exponential function is y = ab^x, where a ≠ 0, b > 0 ,  

  b ≠ 1, and x is any real number

- it has a constant base b

- it has a variable exponent x

- to solve an exponential equation, take the log or ln of both sides,  

  and solve for the variable

* lets solve the problem

∵

- the base is 7 and the exponent is x

- insert ㏑ in both sides

∴

- use the rule

∴ x ㏑(7) = ㏑(77)

- to find x divide both sides by ㏑(7)

∴

* the solution of the equation is 2.23 to the nearest 2 decimal places