The Feulgen reaction is a special test for:

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(B) The Feulgen reaction is a staining technique used in histology to identify chromosomal material or $DNA$ in cell nuclei.It relies on the acid hydr

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$DNA$

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(B) The Feulgen reaction is a staining technique used in histology to identify chromosomal material or $DNA$ in cell nuclei.It relies on the acid hydrolysis of $DNA$,which exposes aldehyde groups on the deoxyribose sugar.These aldehyde groups then react with Schiff's reagent to produce a distinct magenta or purple color,specifically indicating the presence of $DNA$.

Column-$I$	Column-$II$
$(1)$ Chromosome arms are of equal length	$(a)$ Submetacentric
$(2)$ One arm of the chromosome is shorter	$(b)$ Acrocentric
$(3)$ One arm is extremely long and the other is very short	$(c)$ Telocentric
$(4)$ Terminal centromere	$(d)$ Metacentric

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