The Lactose Analog Isopropyl- $\beta$ -D-Thio-Galactoside (IPTG)is Often Used to Regulate Gene Expression Systems in Regulate

question 61

Multiple Choice

The lactose analog isopropyl- $\beta$ -D-thio-galactoside (IPTG) is often used to regulate gene expression systems in bacteria.IPTG does not act as a substrate for $\beta$ -galactosidase,but can bind to,and inactivate,repressor.In this case,IPTG serves as a(n)

• A)inducer.
• B)repressor.
• C)effector.
• D)operon.

---

Definitions:

Diseconomies of Scale

A situation where a business grows so large that the costs per unit increase. It occurs when economies of scale no longer function for a firm.

Production Function

An equation or model that describes the relationship between inputs used in production and the output produced.

Diminishing Returns

The principle stating that if one factor of production is increased while others remain constant, the overall returns will incrementally decrease after a certain point, leading to reduced efficiency.

Decreasing Returns to Scale

A situation in which a proportional increase in all inputs results in a less-than-proportional increase in output.