Franklin and Wilkins Analyzed DNA by Bombarding DNA Crystals with X-Rays

question 27

Multiple Choice

Franklin and Wilkins analyzed DNA by bombarding DNA crystals with X-rays. Their analysis yielded two numbers that sparked interest, 3.4 nm and 0.34 nm. What is the significance of these numbers?

• A) It turned out to be just a coincidence.
• B) DNA molecules are 3.4 nm long and 0.34 nm wide.
• C) The width of a DNA molecule is 3.4 nm, whereas the width of a nucleotide monomer is 0.34 m.
• D) These numbers demonstrate there are 10 rungs, or steps, on the DNA "ladder" for every turn of the helix.
• E) The 10 to 1 ratio signifies that DNA molecules are 10 times longer than they are wide.

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