Question

i)    Select  the correct pair .

a) Gene Z- Transacetylase 
                                   b)GeneY-Beta–galactocidase

c)Gene a- Beta-galactosid permease   
  
 d) Gene I-Repressor

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Answer 1

ANSWER :

(a) Gene Z - Beta-galactocidase

(b) Gene Y - Beta-galactosid permease

(c) Gene A - Transacetylase

(d) Gene I - Repressor

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Answer 2

Answer:

The correct option is d) Gene I - Repressor

Explanation:

• Lac operon (lactose operon), a group of genes with a promoter, encodes genes that are involved in the transport and metabolism of lactose in E.coli and other enteric bacteria. This operon was observed by François Jacob and Jacques Monod. It allows for the effective digestion of lactose in the absence of glucose by the activity of an enzyme, beta-galactosidase. This form a polycistronic transcript that produces multiple proteins from a single mRNA transcript.
• The lac operon consists of (a) lacZ - The gene product is beta-galactosidase. It cleaves lactose into glucose and galactose. (b) lacY - The gene product is beta-galactoside permease. It helps in the cellular transport of lactose in the cell. (c) lacA - The gene product is galactoside acetyltransferase. (d) lacI - It produces repressor protein. In the absence of lactose, it halts the expression of lac genes.  
• It helps to study prokaryotic gene regulation.  

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