Which term describes a laboratory method to isolate DNA from a sample using physical and chemical steps?

• A. Water Bath
• B. Clinical Trials
• C. DNA Isolation
• D. Erlenmeyer Flask

Answer: (C)

The main idea here is a laboratory method that separates DNA from a sample using physical disruption and chemical treatments. DNA isolation, also called DNA extraction, fits that description perfectly because it involves breaking open cells (physical disruption) and using buffers, detergents, salts, and often precipitating steps to separate and purify the DNA from proteins, lipids, and other cellular components.

Water bath is just a controlled heating step used for various purposes, not a comprehensive method to extract DNA. Clinical trials are studies testing treatments in humans, not a lab technique for DNA. An Erlenmeyer flask is simply a container, not a procedure. So the best choice is DNA isolation.