Expressed Sequence Tags (ESTs) refers to :

• Polypeptide expression

• DNA polymorphism

• Novel DNA sequences

• Genes expresses as RNA

452.

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

5' AACAGCGGUGCUAUU 3'

• Deletion of G from 5^th position

• Insertion of A and G at 4^th and 5^th positions respectively

• Deletion of GGU from 7^th, 8^th and 9^th positions

• Insertion of G at 5^th position

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

A. i gene	(i) β-galactosidase
B. z gene	(ii) Permease
C. a gene	(iii) Repressor
D. y gene	(iv) Transacetylase

Select the correct option

• A - (iii); B - (i); C - (ii); D - (iv)

• A - (iii); B - (i); C - (iv); D - (ii)

• A - (iii); B - (i); C - (i); D - (ii)

• A - (i); B - (iii); C - (ii); D - (iv)

DNA precipitation out of a mixture of biomolecules can be achieved by treatment with

• Chilled ethanol

• Methanol at room temperature

• Chilled chloroform

• Isopropanol

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

• Genetic code is redundant

• Genetic code is nearly universal

• Genetic code is specific

• Genetic code is not ambiguous

Purines found both in DNA and RNA are

• Adenine and guanine

• Guanine and cytosine

• Cytosine and thymine

• Adenine and thymine