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

(a)	i  gene	(i)	$\mathrm{\beta }$ -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)

Purines found both in DNA and RNA are:

Under which of the following conditions will there be no change in the reading frame of the following mRNA?

5'AACAGCGGUGCUAUU 3'

Expressed Sequence Tags (ESTs) refers to:
1. Novel DNA sequence
2. Genes expressed as RNA
3. Polypeptide expression
4. DNA polymorphism

Which of the following features of genetic code does allow bacteria to produce human insulin by recombinant DNA technology?

1. Genetic code is specific

2. Genetic code is not ambiguous

3. Genetic code is redundant

4. Genetic code is nearly universal

One gene – one enzyme hypothesis was postulated by:

1. R. Franklin

2. Hershey and Chase

3. A. Garrod

4. Beadle and Tatum

One gene-one enzyme relationship was established for the first time in:

1. Neurosporacrassa

2. Salmonella typhimurium

3. Escherichia coli

4. Diplococcuspneumonia

Which one of the following pairs of nitrogenous bases of nucleic acids is wrongly matched with the category mentioned against it?

1. Thymine, Uracil - Pyrimidines
2. Uracil, Cytosine - Pyrimidines
3. Guanine, Adenine - Purines
4. Adenine, Thymine - Purines

DNA or RNA segment tagged with a radioactive molecule is called:

Which one of the following is used as a vector for cloning genes into higher organisms?

1. Baculovirus

2. Salmonella typhimurium

3. Rhizopus nigricans

4. Retrovirus