What is the purpose of resuspending DNA at the end of a DNA extraction protocol?

• A. To put purified DNA back into solution for storage or downstream applications.
• B. To remove DNA from solution.
• C. To convert DNA to RNA.
• D. To degrade proteins.

Answer: (A)

Resuspending DNA at the end of a extraction brings the purified DNA back into solution so it can be stored and used in later steps. During extraction DNA is often removed from solution or carried on a solid phase, so re-dissolving it in an appropriate buffer (like a Tris-based buffer with proper salt and possibly EDTA) makes the DNA accessible for quantification and downstream applications such as PCR, sequencing, or cloning. The buffer also helps keep DNA stable and protected from nucleases. The other options don’t fit because removing DNA from solution would defeat the goal of having it usable, converting DNA to RNA is a different process (transcription), and degrading proteins is not what resuspension accomplishes in this context.