Perform a literature search for the famed journal article, “The Structure of DNA,” published by Watson and Crick in 1953. What is the article’s unique PubMed ID (PMID) number? Group of answer choices 13168976 14520254 13784125 12789004
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In 1953, the scientists James Watson and Francis Crick published their landmark findings on the structure of DNA. Watson and Crick deduced the structure of DNA by unifying evidence that they collected from several scientists who were also seeking to answer this important question. Identify the pieces of evidence describing the features of DNA that Watson and Crick used to determine the structure of DNA. A purine base forms hydrogen bonds to pair with a pyrimidine base located on the opposite DNA strand. Specifically, A pairs with T, and C pairs with G. A purine base forms covalent bonds with a pyrimidine base located on the opposite DNA helix. The two chains are parallel, both running in a 5' to 3' direction. The sugar–phosphate backbones of each DNA helix run antiparallel to one another. The nitrogenous bases on each DNA helix are arranged perpendicularly to the central axis. The diameter of the DNA double helix is 2 nanometers, with each purine–pyrimidine base pair spanning an equivalent distance between the two chains.
Dominador T.
Newsdate: March $1,2030 .$ A unique creature has been discovered during exploration of outer space. Recently, its genetic material has been isolated and analyzed. This material is similar in some ways to DNA in its chemical makeup. It contains in abundance the 4 -carbon sugar erythrose and a molar equivalent of phosphate groups. In addition, it contains six nitrogenous bases: adenine (A), guanine (G), thymine (T), cytosine (C), hypoxanthine (H), and xanthine (X). These bases exist in the following relative proportions: $A=T=H$ and $C=G=X$ X-ray diffraction studies have established a regularity in the molecule and a constant diameter of about $30 \AA$. Together, these data have suggested a model for the structure of this molecule. (a) Propose a general model of this molecule. Describe it briefly. (b) What base-pairing properties must exist for $\mathrm{H}$ and for $\mathrm{X}$ in the model? (c) Given the constant diameter of $30 \AA,$ do you think that either (i) both $\mathrm{H}$ and $\mathrm{X}$ are purines or both pyrimidines, or (ii) one is a purine and one is a pyrimidine?
Sri K.
Describe the data used by Watson and Crick to determine the structure of DNA
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