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Jacob and Monod studied lactose metabolism in E.coli and proposed operon concept. Operon concept is applicable for

1. all prokaryotes
2. all prokaryotes and some eukaryotes
3. all prokaryotes and all eukaryotes
4. all prokaryotes and some protozoans

Correct answer: all prokaryotes and some eukaryotes

Solution

Operons are common in prokaryotes, where multiple genes can be controlled together from one promoter. A few eukaryotes also show operon-like organization, so the concept is not limited strictly to prokaryotes.

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