What Would Be the Most Likely Result on the Regulation

question 22

Multiple Choice

What would be the most likely result on the regulation of the lac operon from a nonfunctional repressor protein?

• A) transcription of the lactose metabolizing genes, even when lactose is absent
• B) no transcription of the lactose metabolizing genes, even when lactose is present
• C) binding of the repressor protein to the operator, even when lactose is present
• D) binding of the repressor protein to the regulatory gene in both the presence and absence of lactose
• E) no transcription of the regulatory gene, even in the presence of lactose

---

Definitions:

Hydrolysis

A chemical reaction in which water is used to break down the bonds of a particular substance, such as in the digestion of nutrients.

Macromolecules

Large molecules essential for life, including proteins, nucleic acids, carbohydrates, and lipids, which perform a variety of vital functions in cells.

Competitive Inhibition

A form of enzyme inhibition where a substance competes with the substrate for binding to the active site of the enzyme.

Enzymes

Enzymes are biological molecules, typically proteins, that significantly speed up the rate of virtually all chemical reactions within cells without being consumed by those reactions.