Nucleosome are group of cytosine molecules surrounded by dna strands
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(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.
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