Isotopes used in proving semiconservative replication of DNA were:

(1) ¹⁴N ¹⁴C            

(2) ¹⁴N ¹⁵N            

(3) ¹⁴N ³¹P             

(4) ¹⁴C ³¹P

If in a DNA molecule cytosine is 18%, the percentage of adenine would be:

(a) 18%                (b) 32%                (c) 36%                (d) 64%

Out of 64 codons how many of them code for amino acids?

(1) 64                            

(2) 20                            

(3) 61                            

(4) 32

The locations in human genome which differ by a single base difference is known as

(1)Single nucleotide mutation

(2)Single nucleotide polymorphism

(3)RFLP

(4)Single nucleotide polymorphogenesis

The largest known human gene is

(1) Dystrophin protein gene on X chromosome

(2) Sry gene on Y chromosome

(3) Dystropin protein gene on Y chromosome

(4) Sry gene on X chromosome

Which of the following RNA polymerase catalyses the formation of transfer RNA in eukaryotes?

(1) RNA polymerase I                        

(2) RNA polymerase II

(3) RNA polymerase I and II              

(4) RNA polymerase III

If an E.coli with heavy DNA allow to grow for 80 minutes in a culture medium of 14 NH 4

Cl, then what would be the proportion of heavy,light and hybrid densities DNA molecule

respectively?

1. 1/16 : 1/16 : 14/16

2. 0/16 : 14/16 : 2/16

3. 1/16 : 14/16 : 1/16

4. 1/8 : 2/8 : 6/8

The number of autosomal chromosomes in the human beings are

(1) 44

(2) 22

(3) 2

(4) 1

Circular DNA is found in:
(1) Viruses

(2) Bacteria, chloroplast and mitochondria

(3) Chloroplast and mitochondria alone

(4) All of these