Word: helixes
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...edible Helix pomatia made savory with garlic and butter...
...analysis of this type--hemoglobin and myoglobin. The latter, which carries oxygen in the muscles, was the first whose structure was determined. Kendrew's model shows it to be a three-dimensional "lace-work of fabulous complexity," devoid of any regular or simplifying features, apart from the alpha-helix...
...genetic substance of cells. Information on its chemical composition suggested that it was a very long, thin molecule made up of sugar groups (deoxyribose), phosphate groups, and nitrogen-containing "bases." Further, X-ray diffraction patterns of fibrous DNA indicated that the form of the molecule was a double helix...
From these bits of information, Watson and Crick built up a hypothetical structure of the DNA molecule that appeared to take into account all of the observations then available. Ther model consisted of two strands of alternating sugar and phosphate groups wound about a common axis as a double helix. The bases were attached to the sugar groups and projected toward each other from opposite strands. Finally, hydrogen bonds between the base-pairs formed rung-like links between the two strands...
...reason is that when two strands form a helix, each of the four kinds of bases in a strand must face a particular kind of base, its complement, in the opposite strand. Hybridization occurs only where strands of DNA are complementary and suggests similarity in base sequence...