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NEET Biology Molecular basis of Inheritance / विरासत का आणविक आधार Question Bank Self Evaluation Test - Molecular Basis of Inheritance

  • question_answer
    The given figure shows lac operon model and its functioning. Select the option which correctly labels A, B, X, Y and Z marked in the figure and also identify the label (L) which is primarily responsible for the hydrolysis of the disaccharide, lactose, into galactose & glucose.

    A)
    A B X Y Z L
    Repressor Inducer \[\beta \]-Galactosidase Permease Transacetylase X
     

    B)       
    Repressor Inducer Permease \[\beta \]- Galactosidase Transacetylase Y
     

    C)       
    Inducer Repressor \[\beta \]- Galactosidase Permease Transacetylase Z
     

    D)       
    Inducer Repressor \[\beta \]- Galactosidase Transacetylase Permease B
     

    Correct Answer: A

    Solution :

    [a] In the given figure of lac operon model (proposed by Jacob and Monad), the labels A, B, X, Y and Z are respectively represser, inducer, \[\beta \] - galactosidase (z), permease (y), transacetylase [a], z, y and a are three structural genes which produces three enzymes for the degradation of lactose to glucose and galactose. Label X (P- galactosidase) is primarily responsible for the hydrolysis of disaccharide lactose into galactose and glucose.


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