9. Watson and Crick used scientific reasoning, their knowledge of biochemistry, and the research of otherscientists to make one of the most important scientific claims of their time: DNA is a double helix withstrands running in opposite directions. Between these strands, A pairs with T, and C pairs with G.Complete the table on the following page to explain the evidence that Watson and Crick used to support thisclaim:DNA is a double helix with strands running in opposite directions. Between these strands, A pairs withT, and C pairs with G.Film ActivityStudent HandoutThe Double HelixDNA & RNA Updated February 2020www.BioInteractive.org Page 4 of 4Evidence: (List three pieces of evidence for the claim. Name the scientists who were responsible foreach piece.)Reasoning: (In full sentences, explain how each piece of evidence supports the claim.)10. Even before the structure of DNA was known, studies indicated that the genetic material must have thefollowing properties:• be able to store information• be consistently replicated between generations• be able to allow for changes, and thus evolution, to occurExplain how the structure of DNA gives it these three properties. Write one or two sentences per property

In the Watson-Crick model for the DNA double helix, which of the following is true?Group of answer choicesThe strands are held together by peptide bondsThe strands are held together by ionic bondsThe DNA strands are parallelThe DNA strands are anti-parallel

b. What conclusions did Watson and Crick reach after seeing this imageand reading Franklin’s report discussing the symmetry of DNA?

While researching a topic, a student has taken the following notes: James Watson and Francis Crick proposed the double helix structure of DNA in 1953. This structure allowed for DNA to be easily copied during cell division. Watson and Crick initially thought DNA copied itself through a conservative mechanism. Their discovery revolutionized the understanding of genetics. An improved understanding of genetics has led to breakthroughs in medical treatments.27Mark for ReviewABCThe student wants to emphasize the significance of Watson and Crick's discovery. Which choice most effectively uses relevant information from the notes to accomplish this goal?AWatson and Crick's proposal of the double helix structure of DNA in 1953 revolutionized the understanding of genetics, leading to breakthroughs in medical treatments.BIn 1953, Watson and Crick proposed the double helix structure of DNA, which they initially believed copied itself through a conservative mechanism.CThe double helix structure of DNA facilitates copying of DNA during cell division.DEven though Watson and Crick's double helix model revolutionized the understanding of genetics, they incorrectly believed at first that DNA copied itself through a conservative mechanism.

How does the structure of DNA identified by Watson and Crick differ from the model previously proposed by Linus Pauling and others?

British scientists James Watson and Francis Crickwon the Nobel Prize in part for their 1953 paperannouncing the double helix structure of DNA, but itis misleading to say that Watson and Crickdiscovered the double helix. _______ findings werebased on a famous X-ray image of DNA fibers,“Photo 51,” developed by X-ray crystallographerRosalind Franklin and her graduate studentRaymond Gosling.Which choice completes the text so that it conformsto the conventions of Standard English?A) They’reB) It’sC) TheirD) Its