Exercise 1 Solution A.1. (b) DNA and Histones Solution A.2. (c) Coloured bodies Solution B.1. (a) – Nucleotides. (b) – Nucleosome. (c) – Hydrogen Bond. (d) – Phosphate, Sugar and Nitrogenous base. Solution C.1. Chromatin fibre is unfolded, uncondensed, extended DNA. It is only visible when cell under goes division whereas chromosomes are condensed DNA and they are visible when the cell is divided. Solution C.2. Rungs of DNA ladder is made of nitrogenous bases which includes Adenine (A), Guanine (G), Cytosine (C) and Thymine (T). Solution C.3. (a) The four nitrogenous bases in the DNA ladder are Guanine, Thymine, Adenine and Cytosine. (b) Genes are specific sequences of nucleotides on a chromosome. (c) A nucleotide is composed of a phosphate, sugar (pentose) and a nitrogenous base. (d) Nucleosomes are groups of histone molecules surrounded by DNA strands. (e) If there are 46 c
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