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

question 8

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 tell us 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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