The Accompanying Table Lists Several Genotypes Associated with the Lac

question 25

Short Answer

The accompanying table lists several genotypes associated with the lac operon in E.coli.For each,indicate with a "+" or a "-" whether β-galactosidase would be expected to be produced at induced levels.
$\begin{array}{llcc}&\beta \text {-galactosidase production }\\\underline { \text { Genotype } } &\underline {\text { No Lactose \quad \quad With Lactose}} \\(a) \quad I^{+} O+Z+/ F^{\prime} I+O+Z+&\\(b) \quad I-O c Z-/ F^{\prime} I-O c Z- \\(c)\quad I{s} I-O c Z+/ F^{\prime} I-O+Z+ \\(d) \quad Is Oc Z-/F'Is O+Z+\\\end{array}$

$\begin{array}{l}I^{+}=\text {wild-type repressor } \\I^{-}=\text {mutant repressor (unable to bind to the operator) } \\I^{s}=\text { mutant repressor (insensitive to lactose) } \\O^{+}=\text {wild-type operator } \\O \mathcal{C}=\text { constitutive operator (insensitive to repressor) }\end{array}$

---

Definitions:

Annuity Due

A type of annuity whose payment is due immediately at the beginning of each period, as opposed to at the end, typical for retirement funds and insurance payouts.

Future Value

The value of an asset or cash at a specified date in the future that is equivalent in value to a specified sum today, often calculating the effects of interest.

Equal Annual Installments

A method of repaying a loan in which the borrower pays the lender the same amount of money each year until the loan, including interest, is fully paid off.

Compounded Monthly

Interest on an investment or loan calculated on a monthly basis, where the interest earned each month is added to the principal, and future interest is based on this new amount.