Gene Regulation Lac Operon

Select the two correct statements out of the four (a-d) given below about lac operon:

(a)	Glucose or galactose may bind with the repressor and inactivate it.
(b)	In the absence of lactose, the repressor binds with the operator region.
(c)	The z-gene codes for permease.
(d)	It was explained by Francois Jacob and Jacque Monod.

The correct statements are:
1. (b) and (c)
2. (a) and (c)
3. (b) and (d)
4. (a) and (b)

Which enzyme(s) will be produced in a cell in which there is a non-sense mutation in the lac Y gene?

1.	Lactose permease
2.	Transacetylase
3.	Lactose permease and transacetylase
4.	\beta - galactosidase

Select the correct match:

1. Alec Jeffreys – Streptococcus pneumoniae

2. Alfred Hershey and Martha Chase – TMV

3. Matthew Meselson and F. Stahl – Pisum sativum

4. Francois Jacob and Jacques Monod – Lac operon

All of the following are part of an operon except:
1. an operator
2. structural genes
3. an enhancer
4. a promoter

Match the following genes of the lac operon with their respective products:

(a)	i gene	(i)	$\mathrm{\backslash beta}$ -galactosidase
(b)	Z gene	(ii)	Permease
(c)	A gene	(iii)	Repressor
(d)	Y gene	(iv)	transacetylase

Select the correct option

Options:	(a)	(b)	(c)	(d)
1.	(iii)	(iv)	(i)	(ii)
2.	(i)	(iii)	(ii)	(iv)
3.	(iii)	(i)	(ii)	(iv)
4.	(iii)	(i)	(iv)	(ii)

In an E.coli strain i gene gets mutated and its product cannot bind the inducer molecule. If growth medium is provided with lactose, what will be the outcome ?
1. RNA polymerase will bind the promoter region
2. Only z gene will get transcribed
3. z, y, a genes will be transcribed
4. z, y, a genes will not be translated

Match List I with List II

	List I		List II
A.	Gene 'a'	I.	-galactosidase
B.	Gene 'y'	II.	Transacetylase
C.	Gene 'i'	III.	Permease
D.	Gene 'z'	IV.	Repressor protein

Choose the correct answer from the options given below:

Options:	A	B	C	D
1.	III	I	IV	II
2.	II	I	IV	III
3.	II	III	IV	I
4.	III	IV	I	II

The lactose present in the growth medium of bacteria is transported to the cell by the action of:

1.	Acetylase	2.	Permease
3.	Polymerase	4.	Beta-galactosidase