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Solution


Q.

All of the following are part of an operon except                      [2018]
1 an operator  
2 structural genes  
3 an enhancer  
4 a promoter  

Ans.

(3)

Operon concept is for prokaryotes that consist of operator gene, promoter gene, regulator gene and structural gene. Structural, operator and regulator genes are also present in eukaryotic gene expression along with enhancer gene but enhancer gene is present only in eukaryotic gene expression. It changes the rate of transcription of structural genes.