Histones are rich in amino acids:

Go through the following diagram of Nucleosome (structural unit of chromatin). Identify its componential parts indicated by A, B and C:

A typical nucleosome unit consists of about:

What are those structures that appear as ‘beads-on-string’ in the chromosomes when viewed under electron microscope?

(1) Nucleotides

(2) Nucleosomes

(3) Base pairs

(4) Genes

Heterochromatin:

A. Is more densely packed      B. Is stains dark

C. Is transcriptionally active    D. Is transcriptionally inactive

(1) A, C                

(2) A, B, C, D        

(3) B, C, D            

(4) A, B, D

The length of DNA molecule greatly exceeds the dimensions of the nucleus in eukaryotic cells. How is this DNA accommodated?

(1) Deletion of non essential genes

(2) Super-coiling in nucleosomes

(3) DNAse digestion

(4) Through elimination of repetitive DNA

Transcriptionally active chromatin is termed as:
1. Heterochromatin

2. Euchromatin

3. Prechromatin

4. Prochromatin

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

The length of E. coli DNA and length of DNA in a human 2N cell is:

(1) 1.36 mm and 2.2 m respectively  

(2) 1.36 mm and 2.2 mm respectively

(3) 1.3 ìm and 2.2 ìm respectively    

(4) 1.36 cm and 2.2 cm respectively

During DNA packaging in eukaryotic cells, Non Histone Chromosomal proteins: