Question

question 20 (1 point) dna can be seen under uv light as orange bands when this dye is trapped in dna molecules. bromophenol blue ethidium bromide cyanole xylene all the above

Explanation:

Ethidium bromide (EtBr) is a fluorescent dye that intercalates into DNA. When exposed to UV - light, the DNA - EtBr complex emits an orange fluorescence, allowing DNA to be visualized as orange bands. Cyanole xylene is not used for visualizing DNA under UV in this way, and bromophenol blue is a tracking dye in gel electrophoresis but does not make DNA appear as orange bands under UV.

Answer:

C. Ethidium bromide