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It seems that biology books refer to DNA as 'a' molecule (implying that it is a single continuous uninterrupted strand) ... but in those same books chromosomes are depicted as separate objects containing DNA. Are these illustrations misleading ? Are chromosomes connected end to end by DNA threads ?
(Regardless of the notion that each cell contains maternal and paternal DNA, if you take only one of the two is it a single piece that coils up at regular intervals to form chromosomes or is multiple disjointed chunks and each chunk is coiled into a chromosome)