Q2 of 33 Page 10

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

The rungs of “DNA ladder” made up of nitrogenous bases. DNA contains four different types of nitrogenous bases: adenine (A), thymine (T), cytosine (C) and guanine (G).


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1

Name the following:

The three components of a nucleotide.

 1

What is the difference between chromatin fiber and chromosome?

 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.

 1

What are nucleosomes?