Question

DNA fragments can be seen in which colored bands when they are stained with ethidium bromide and exposed to UV radiation ?

• A. Yellow
• B. Bright orange
• C. Red
• D. Bright yellow

Answer 1

Answer:

B. Bright orange

When DNA fragments are stained with ethidium bromide and exposed to UV radiation, they appear as:

Orange-colored bands

• Ethidium bromide intercalates into the DNA double helix and emits a bright orange fluorescence when excited by UV light, making it possible to visualize the DNA fragments.