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Question

Choose the correct answer from the alternatives given :
The given figure shows lac operon and its functioning. Select the option which correctly labels A, B, X, Y and Z.
928620_cf37d16f05c244d2a1ac31d49bf5a6f2.png


A
A - Repressor, B - Inducer, X - β galactosidase, Y - Permease, Z - Transacetylase
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B
A - Repressor, B - Inducer, X - Permease, Y - β galactosidase , Z - Transacetylase
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C
A - Inducer, B - Repressor, X - β galactosidase , Y - Permease, Z - Transacetylase
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D
A -  Inducer, B - Repressor, X - β galactosidase, Y - Transacetylase, Z - Permease
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Solution

The correct option is A A - Repressor, B - Inducer, X - $$\beta$$ galactosidase, Y - Permease, Z - Transacetylase
The Lactose operon gene in E.coli is a polycistronic gene, A is a repressor that binds to the inducer region in absence of Lactose, in presence of Lactose the inducer protein binds to the repressor. 
X- is $$\beta$$ Galactosidase that converts lactose to glucose and galactose. 
Y-permease, a transporter protein that transports Lactose from the medium into the cell
Z- is transacetylase that transfers acetyl group from acetyl CoA  to $$\beta$$ galactosides
So, the correct answer is 'A Repressor, B Inducer, X - 
ββ galactosidase, Y Permease, Z - Transacetylase'

Biology

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