Double Helix Research Paper

The pictures were shown to James Watson and Francis Crick by Maurice Wilkins. They were then able to confirm their theory about the 3D structure of DNA. In 1962, they were awarded the Nobel Prize in Physiology or Medicine for solving the structure of DNA. The Nobel committee could not award it to Franklin because the Nobel prize could only be shared by three people and also because she was already dead (DNA from the Beginning, 2011)

The pictures were shown to James Watson and Francis Crick by Maurice Wilkins. They were then able to confirm their theory about the 3D structure of DNA. In 1962, they were awarded the Nobel Prize in Physiology or Medicine for solving the structure of DNA. The Nobel committee could not award it to Franklin because the Nobel prize could only be shared by three people and also because she was already dead (DNA from the Beginning, 2011)

Franklin came very close to realizing this structure. In fact, she had already started to document her work, convinced of the structure; however, there were two key things that she missed. These two things were things she failed to see in her own data, but that Watson and Crick picked up on. The first of the two, which Crick noticed, was the fact that the two strands of DNA run in opposite direction of one another: One goes up and the other goes down. Franklin would have put both strands running in the same direction. Crick picked up on this point from a technical similarity in DNA and the hemoglobin that he was working on [Judson, 1986]. The second point, which Watson discovered, was the unique pairing of the bases in DNA. They are set up such that each strand is complementary to the other and if the two

Over the course of the modern age, the human body was still a mystery waiting to be solved. The body contains secrets one can only hope to discover. Over the twentieth century, scientists tried to understand one of the most complex concepts in the biological field. DNA (Deoxyribonucleic acid) was at the forefront of research. Several theories claimed to have solved the structural concept of DNA. However, it was not until Francis Crick and James D. Watson discovered the true structure, the double helix. However, many potential models of DNA had passed through the biology field until eventual lose of credibility. The past models would contain a fixed detail that would make the entire concept invalid. In James D. Watson book, The Double Helix, he illustrates his path amid incorrect theories until he reaches the model that is taught around the world today.

When Pauling and Cory attempted to come up with the structure of DNA, they thought that the DNA helix was a triple helix. This was because they misinterpreted DNA A structure and concluded that the phosphate and sugars were on the inside and the nucleotide bases were on the outside. Watson and Crick said this was not possible because phosphates can’t fit together inside the helix without breaking their molecular bonds. The studies Watson and Crick made were based off of DNA B molecule from the X-ray of DNA B taken by Rosalind Franklin that had low concentration, rather than A DNA which was high in salt concentration that gave Pauling an improper representation of the DNA helix. Pauling and Cory stated that the helix was made of three helices, Watson and Crick disapproved of this concept because phosphate backbones are negatively charged, it was impossible to put three negatively charged strands with each

2. What role did James Watson & Francis Crick play in our understanding of DNA’s structure? They discovered the 3D structure.

Chapter 1: Genes can be demonstrated as “instruction books for making functional markers such as ribonucleic acid(RNA) and proteins”(Chapter 1, page 4). Distinctively, the four nitrogenous bases to code the gene of DNA is adenine, thymine, guanine, and cytosine. In addition, Rosalind Franklin was among the primitive people to experiment with X rays as a form of molecular photography in order to learn more about DNA and its structure. The structure of DNA taught a constitutional fact about genetics; it stated that the two strands of DNA were complementary to each other. Moreover, DNA replicates in order to make new sets of

In Time Magazine an article states On February 28 1953, James Watson and Francis Crick broke the DNA code and discovered that the DNA strand is double helix and forms like a ladder. They found that cytosine and guanine were paired together and that adenine and thymine were paired. They discovered the building block of life (Wright, 1999). DNA is found in all living organisms.

Watson and Crick discovered that cell’s nucleuses contained a molecule that was called deoxyribonucleic acid, or DNA. The clues from the diary are: “Even us lab boys knew that there had been gossip going around the labs that Crick and Watson had been trying to solve the structure of this new-fangled molecule called DNA – deoxyribonucleic acid – but discovering the secret of life itself?”

Watson and Crick discovered that cell’s nucleuses contained a molecule that was called deoxyribonucleic acid, or DNA. The clues from the diary are: “Even us lab boys knew that there had been gossip going around the labs that Crick and Watson had been trying to solve the structure of this new-fangled molecule called DNA – deoxyribonucleic acid – but discovering the secret of life itself?”

In 1953 four scientists: James Watson, Francis Crick, Maurice Wilkins and Rosalind Franklin completed a DNA model which they created using observed X-ray diffraction patterns. This model showed how the structure of DNA was able to transmit genetic information from parents to their offspring.

Deoxyribonucleic acid, commonly known as DNA, was first discovered by Johann Mieschere, a Swiss biologist, in 1869. He made the discovery while studying the nuclei of leukocytes, however the greater significance of this molecule and its structure would not be known until 1951. At that time, scientists did not know the function of DNA, let alone the structure. It was believed that the structure of the mysterious molecule would help uncover its true function. The structure of DNA was solved by James Watson and Francis Crick at the University Of Cambridge, England. They deduced that DNA was made up of chains of nucleotides with one of the four different bases: Adenine, Thymine, Guanine and Cytosine on the inside and its phosphate backbone on the outside, thus creating the double helix. This discovery could be considered the single most important finding that gave rise to the study of heredity and gene expression. However, Watson and Crick could not have revealed the three-dimensional structure of DNA without the previous contributing research conducted by Erwin Chargaff, Phoebus Levene, and Rosalind Franklin.

Hershey and Chase Radioactively tagged and then tracked infected bacteria in order to prove that DNA was in fact the molecule of heredity and transferring of genetic material

1953, Watson and Crick discovered one of the biggest mysteries of the human body; the DNA

Rosalind Franklin’s work on DNA was crucial in discovering the composition of the human body as a whole. Her x-ray photo revealed a double helix structure and she also discovered the A and B form of DNA. She worked through the adversity of being a female in a predominately male dominated realm and made remarkable findings that were eventually stolen. She adapted to a new lab with antiquated technology. Before this discovery, the structure of DNA was thought to be simple. Scientist, Watson and Crick, started with the wrong structure of DNA from a misinterpretation of notes from one of Franklin’s presentations. Unlike Watson and Crick, Rosalind Franklin could explain DNA and how it worked.