Question

the chemical ____________________ is used in gel electrophoresis and is a known carcinogen. this chemical is used because it inserts itself into dna and glows under uv light. hydrogen peroxide phenol red ethidium bromide methylene blue

Explanation:

Ethidium bromide is a chemical used in gel electrophoresis. It is a known carcinogen. It intercalates (inserts) into DNA. When exposed to UV light, DNA - ethidium bromide complex fluoresces (glows). Hydrogen peroxide is a strong oxidizing agent, phenol red is a pH indicator, and methylene blue is used for staining cells or as a redox indicator, none of which have the property of intercalating into DNA and glowing under UV in the context of gel electrophoresis as described.

Answer:

ethidium bromide