DNA fragments are

(1) positively charged

(2) negatively charged

(3) neutral

(4) either positively or negatively charged depending on their size

The association of histone H₁ with a nucleosome indicates 

(1) transcription is occuring

(2) DNA replication is occuring

(3) the DNA is condensed into chromatin fibre

(4) the DNA double helix is exposed

Which of the following RNAs should be most abundant in animals cell ?

(1) rRNA

(2) tRNA

(3) mRNA

(4) miRNA

Taylor conducted the experiments to prove semi-conservative mode of chromosome replication on

(1) Vinca rosea

(2) Vicia faba

(3) Drosophila melanogaster

(4) E. coli

The equivalent of a structural gene is

(1) muton

(2) cistron

(3) operon

(4) recon

Which of the following rRNAs act as structral RNA as well as ribozyme in bacteria ?

(1) 5 srRNA

(2) 18 srRNA

(3) 23 srRNA

 (4) 58 srRNA

A molecule that can act as a genetic material must fulfill the traits given below, except

(1) it should be able to express itself in the form of 'Mendelian characters'

(2) it should be able to generate its replica

(3) it should be unstable structurally and chemically

(4) it should provide the scope for slow changes that are required for evolution

Which one of the following is the start codon?

(1) UGA

(2) UAA

(3) UAG

(4) AUG

The experimental proof for semiconservative replication of DNA was first shown in a:

1. Fungus

2. Bacterium

3. Plant

4. Virus

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