What does ''lac'' refer to in what we call the lac operon ?

Options

A. Lac insect
B. The number , 1,00,000
C. Lactose
D. Lactase

Explanation

**Step-by-Step Solution:**

1. **Understanding the Term "Lac Operon":** The term "lac operon" refers to a specific genetic regulatory system found in bacteria, particularly in *Escherichia coli* (E. coli).

2. **Identifying the Components of the Lac Operon:** The lac operon consists of genes that are involved in the transport and metabolism of a sugar called lactose.

3. **Defining "Lac":** In the context of the lac operon, "lac" is an abbreviation that stands for "lactose."

4. **Role of Lactose in the Lac Operon:** Lactose acts as an inducer for the lac operon. When lactose is present, it binds to the repressor protein, causing the operon to remain open and allowing the genes necessary for lactose metabolism to be expressed.

5. **Conclusion:** Therefore, "lac" in the lac operon specifically refers to lactose.

**Final Answer:** The "lac" in lac operon refers to lactose.

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