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Although the proteins that cause the E. coli chromosome to coil are not histones, what property would you expect them to share with histones, given their ability to bind to DNA (see Figure 5.14)?
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14. DNA Synthesis
Discovering the Structure of DNA
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What was Friedrich Miescher's contribution to the discovery of the genetic code?
A
He identified DNA as a distinct molecule, which he called 'nuclein'.
B
He proposed the base-pairing rules for DNA.
C
He demonstrated that DNA is the genetic material.
D
He discovered the double helix structure of DNA.
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Friedrich Miescher was a Swiss physician and biologist who made a significant contribution to the field of genetics by identifying a new substance in the nuclei of cells.
In 1869, Miescher isolated a substance from the nuclei of white blood cells, which he initially called 'nuclein'. This substance was later known as deoxyribonucleic acid (DNA).
Miescher's discovery was crucial because it identified DNA as a distinct molecule, separate from proteins, which were previously thought to be the carriers of genetic information.
Although Miescher did not propose the base-pairing rules, demonstrate that DNA is the genetic material, or discover the double helix structure, his work laid the foundation for future discoveries in genetics.
Understanding Miescher's contribution helps appreciate the historical context of how DNA was first recognized as a unique molecule, paving the way for later discoveries about its role in heredity.
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