Which gene-editing technology allows scientists to precisely add, remove, or alter sections of DNA in living organisms?

• A. telehealth
• B. robotic nursing assistance
• C. CRISPR
• D. surgical robots

Answer: (C)

Precision genome editing in living organisms is what this question is about. A tool that can add, remove, or alter sections of DNA at specific locations enables scientists to make targeted changes rather than random mutations. The technology that fits this description uses a guide molecule to find the exact DNA sequence and a nuclease to cut it. After the cut, the cell’s natural repair processes can be leveraged to insert new DNA, delete a segment, or swap in an altered sequence, yielding precise edits. That's CRISPR, which combines a guide RNA with a Cas enzyme to target and modify genes across many organisms, making it the go-to method for genome editing. The other options relate to healthcare delivery or procedures rather than changing genetic material: telehealth involves remote clinical services, robotic nursing assistance helps with caregiving tasks, and surgical robots assist with operations but do not edit DNA.