Question

The lac operon contains three genes; lacZ, which encodes ___________ , lacY, which encodes Lac ____________ , and lacA, which encodes an enzyme called ______________.

a) β-galactosidase; Permease; Transacetylase
b) β-glucosidase; Permease; Transacetylase
c) β-galactosidase; Polymerase; Transferase
d) β-glucosidase; Polymerase; Transferase

Answer 1

The correct answer is a) β-galactosidase; Permease; Transacetylase. These genes in the lac operon encode enzymes for lactose metabolism in E. coli.

Step-by-step explanation:

The lac operon contains three genes; lacZ, which encodes β-galactosidase, lacY, which encodes Lac permease, and lacA, which encodes an enzyme called transacetylase. Therefore, the correct answer is a) β-galactosidase; Permease; Transacetylase. These genes encode enzymes necessary for the digestion and metabolism of lactose, particularly when other preferred sugars like glucose are not available.