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Comparing operons: differences

 

While the arabinose and lactose operon are somewhat similar in their function, they have many important differences. It is important to note that arabinose is much more complex than lactose operon. Here, you can see a summary of the differences between the two.

           
Quick overview:

Positive Control – when regulatory protein needs to be attached in order for transcription to occur.

Negative Control- when regulatory protein is needed to be removed in order for transcription to occur.

 

Lactose Operon

 

·        The lactose operon’s function is to break down lactose when it is present.

·         The structural genes of lactose operon include, LacZ, LacY, and LacA.

·        The enzymes needed for the break down of lactose operon is galactosidase, galactoside permease, and Thiogalactoside transacetylase.

·        Lactose operon uses mostly negative control. The lactose repressor must be removed for the transcription of structural genes to occur.

·        The regulatory protein only regulates structural proteins.

·         There is only one operator site for the lactose operon  

 

           

Arabinose Operon

 





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