Q1 of 33 Page 10

What is the difference between chromatin fiber and chromosome?

Chromatin fibre is unfolded, uncondensed and extended DNA while chromosome is condensed DNA.

During cell division (mitosis or meiosis), chromatin condenses to form thicker rod-like structures called chromosomes.


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1

Name the following:

The type of bond which joins the complementary nitrogenous bases.

 1

Name the following:

The three components of a nucleotide.

 2

What are the rungs of the “DNA ladder” made of?

 3

Correct the following statements if there is any mistake.

(a) The four nitrogenous bases in the DNA are Guanine, Thiamine, Adrenaline, and Cytosine.


(b) Genes are specific sequences of bases on a chromosome.


(c) A nucleotide is composed of a sulphate, a sugar (pentose) and a nitrogenous base.


(d) Nucleosome is group of cysteine molecules surrounded by DNA strands.


(e) If there are 46 chromosomes in a cell, there will be 23 chromatin fibers inside the nucleus during interphase.