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Hage have on E. coli bacteria? 10. In one experiment they grew bacteriophages in a culture with radioactive sulfur (35S). a. Into what part of the phage was the 35S incorporated? (protein coat or DNA) b. The phages were then allowed to infect E coli. Where was the 35S found after mixing with the E. coli?.

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  1. Click ‘Get Form’ button to access the Dna History Webquest Answer Key. This action allows you to obtain the document that needs to be completed.
  2. Once the form is open, begin by entering your name in the designated field at the top of the document.
  3. Proceed to Section I, which pertains to Friedrich Miescher. Read the provided background and respond to the question about what Miescher was extracting from blood cells.
  4. In Section II, focused on Frederick Griffith, address the questions related to his experiment. Begin by identifying the organisms used and continue through the outlined inquiries, ensuring each answer is complete.
  5. For Section III, which covers Oswald Avery, McCarty, and McLeod, indicate whether each listed molecule caused a transformation by writing 'Yes' or 'No'.
  6. Advance to Section IV, which involves Alfred Hershey and Martha Chase's experiment. Carefully follow the prompts to discuss bacteriophages and the results of their experiments.
  7. In Section V, relating to Erwin Chargaff, respond to the questions about base pairing and the differences between purines and pyrimidines, ensuring accuracy in your explanations.
  8. Move on to Section VI, which focuses on Rosalind Franklin. Provide concise answers to the questions regarding her contributions and findings.
  9. Finally, in Section VII about James Watson and Francis Crick, describe the DNA model components and include any relevant details related to the Nobel Prize.
  10. After completing all sections, review your responses for accuracy. Once satisfied, save your changes, and decide if you would like to download, print, or share the completed form.

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These four scientists—Crick, Franklin, Watson, and Wilkins—codiscovered the double-helix structure of DNA, which formed the basis for modern biotechnology. At King's College London, Rosalind Franklin obtained images of DNA using X-ray crystallography, an idea first broached by Maurice Wilkins.

In a very simple experiment, Oswald Avery's group showed that DNA was the "transforming principle." When isolated from one strain of bacteria, DNA was able to transform another strain and confer characteristics onto that second strain. DNA was carrying hereditary information.

For multiple decades following Miescher's discovery, most scientists continued to believe that protein, not DNA, was the carrier of hereditary information. This changed in 1944, when biologist Oswald Avery performed a series of groundbreaking experiments with the bacteria that cause pneumonia.

Earlier work had shown that DNA is composed of building blocks called nucleotides consisting of a deoxyribose sugar, a phosphate group, and one of four nitrogen bases — adenine (A), thymine (T), guanine (G), and cytosine (C). Phosphates and sugars of adjacent nucleotides link to form a long polymer.

The way in which traits are passed from one generation to the next-and sometimes skip generations-was first explained by Gregor Mendel. By experimenting with pea plant breeding, Mendel developed three principles of inheritance that described the transmission of genetic traits, before anyone knew genes existed.

Because of this possibility, debate over DNA's role continued until 1952, when Alfred Hershey and Martha Chase used a different approach to conclusively identify DNA as the genetic material.

Since the beginning of human history, people have wondered how traits are inherited from one generation to the next.

In 1950, biochemist Erwin Chargaff found that the arrangement of nitrogen bases in DNA varied widely, but the amount of certain bases always occurred in a one-to-one ratio. These discoveries were an important foundation for the later description of DNA. In the early 1950s, the race to discover DNA was on.

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