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NEET 2019
Exam
NEET
Year
2019
Subject
Zoology
Chapter
Molecular Basis of Inheritance

NEET 2019 · Zoology · Molecular Basis of Inheritance

Match the following genes of the Lac operon with their respective...

Match the following genes of the Lac operon with their respective products:
Column-I Column-II
(a)\left(a\right) i gene \left(i\right)</td> <td>&szlig;-galactosidase</td> </tr> </thead> <tbody> <tr> <td>\left(b\right) z gene \left(ii\right)</td><td>Permease</td></tr><tr><td>(c)</td> <td>Permease</td> </tr> <tr> <td>\left(c\right) a gene \left(iii\right)</td><td>Repressor</td></tr><tr><td>(d)</td> <td>Repressor</td> </tr> <tr> <td>\left(d\right) y gene \left(iv\right) Transacetylase

Select the correct option.

Options

  1. Aa−(i);b−(iii);c−(ii);d−(iv)a - \left(i\right); b - \left(iii\right); c - \left(ii\right); d - \left(iv\right)
  2. Ba−(iii);b−(i);c−(ii);d−(iv)a - \left(iii\right); b - \left(i\right); c - \left(ii\right); d - \left(iv\right)
  3. Ca−(iii);b−(i);c−(iv);d−(ii)a - \left(iii\right); b - \left(i\right); c - \left(iv\right); d - \left(ii\right)
  4. Da−(iii);b−(iv);c−(i);d−(ii)a - \left(iii\right); b - \left(iv\right); c - \left(i\right); d - \left(ii\right)

Correct answer

C. a−(iii);b−(i);c−(iv);d−(ii)a - \left(iii\right); b - \left(i\right); c - \left(iv\right); d - \left(ii\right)

Step-by-step solution

The lactose or lac operon of Escherichia coli is a cluster of three structural genes encoding proteins which is involved in lactose metabolism and the sites on the DNA taking part in regulation of the operon. The three genes are: (A)\left(A\right) lacZ: it encodes for enzyme β-galactosidase (which splits lactose into glucose and galactose); (B)\left(B\right) lacY: it encodes for lactose permease; and (C)\left(C\right) lacA: It encodes for lactose transacetylase. Functional β-galactosidase and lactose permease are necessary for the usage of lactose by this bacterium. The concentration of these proteins are in low quantity when the organism is grown on carbon sources other than lactose.
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