Which best summarizes the scientific process that led to our current understanding of DNA?

• A. A series of experiments, including X-ray crystallography by Rosalind Franklin and model building by Watson and Crick, revealed the double helix structure of DNA.
• B. The structure of DNA was discovered by observing its behavior under a light microscope.
• C. The double helix model was proposed based on the chemical properties of proteins.
• D. DNA's structure was deduced solely from Mendel's genetic experiments with pea plants.

Answer: (A)

Verified step by step guidance

1. Understand the question: The problem asks for a summary of the scientific process that led to the discovery of DNA's structure. It also provides multiple statements, and we need to identify the most accurate one.
2. Step 1: Recall the historical context of DNA discovery. The structure of DNA was not discovered through a single experiment but through a series of collaborative efforts by multiple scientists.
3. Step 2: Highlight key contributions: Rosalind Franklin's X-ray crystallography provided critical data about DNA's helical structure. Watson and Crick used this data, along with model building, to propose the double helix structure.
4. Step 3: Eliminate incorrect options: DNA's structure was not observed under a light microscope (light microscopes lack the resolution to visualize DNA). The double helix model was not based on the chemical properties of proteins, as DNA is a nucleic acid, not a protein. Mendel's experiments with pea plants provided foundational knowledge of inheritance but did not directly reveal DNA's structure.
5. Step 4: Select the correct answer: The most accurate summary is that a series of experiments, including X-ray crystallography by Rosalind Franklin and model building by Watson and Crick, revealed the double helix structure of DNA.