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STD 12 - 5. molecular basis of inheritance — Biology STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 5. molecular basis of inheritance1 Mark
MCQ
Lactose operon produces enzymes
  • A
    $b-$galactosidase, permease and glycogen synthetase.
  • ✓
    $b-$galactosidase, permease and transacetylase.
  • C
    permease, glycogen synthetase and transacetylase.
  • D
    $b-$galactosidase, permease and phosphoglucose isomerase.
✓

Answer

Correct option: B.
$b-$galactosidase, permease and transacetylase.
b
Lactose operon (model proposed by Jacob and Monad) produces three enzymes -$ b-$ galactosidase $(z)$, permease $(y)$, transacetylase $(a) . $b-\; Galactosidase $(z)$ is responsible for the splitting of lactose into glucose and galactose. Permease $(y)$ is required in entry of the lactose/galactose. Transacetylase $(a)$ transfers an acetyl $CoA$ to $ b-$Galactosides.

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