The Table Below Lists Several Genotypes Associated with the Lac

question 31

Short Answer

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

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

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Definitions:

Perpetual Inventory System

A continuous tracking method for inventory that records the sale or purchase of inventory immediately through the use of computerized point-of-sale systems and enterprise asset management software.

LIFO

Last In, First Out, an inventory accounting method where the last items placed in inventory are the first ones to be used or sold.

Ending Inventory

Products' value that is available for transaction at the culmination of an economic period.

Merchandise Inventory

Goods held by a business for the purpose of resale to customers in the ordinary course of business.