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Ans : (c) ethidium bromide
We can see bright Orange coloured bands of DNA on an agarose gel only after staining with ethidium bromide and exposure to UV light.
DNA fragments are (a) negatively charged (b) neutral (c) either positively or negatively charged depending on their size (d) positively charged.
In a mixture, DNA fragments are separated by (1) Polymerase chain reaction (2) Bioprocess engineering (3) Restriction digestion (4) Electrophoresis