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Playing with polymers crossword puzzle answer key
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Starch is made of two types of glucose polymers: amylose and amylopectin. Amylose is a linear polymer composed completely of alpha D-glucose. In amylose, the alpha orientation of the glucose molecules allows for the glucose molecules to connect linearly, rather than in a branched pattern. In nature, amylose is not straight, but rather coiled like a spring with about six glucose molecules per turn. The glucose molecules are linked with 1-4 alpha linkages, meaning the first and fourth carbon are connected in amylose.
This crossword puzzle is based on the lesson on the comparison between starch and cellulose in terms of their structure and function. For this activity, complete the crossword by filling in a word that fits each of the given clues. To do this, you can just right click the crossword given below to save the image and print it. With a pencil and an eraser, neatly write your answers in the boxes provided.
In order to understand why polytetrafluoroethylene (PTFE) is a useful nonstick coating, we must take a closer look at its structure and properties. PTFE is a type of fluoropolymer. A polymer is a large molecule made up of smaller molecules of the same type. Fluoropolymers are polymers that include the fluorine atom, which is the key to many of the unique characteristics of PTFE. According to William Raiford, technology manager with DuPont Fluoroproducts, fluorine's electron structure is very stable -- it doesn't share its electrons with other atoms easily.
PTFE is not the only fluoropolymer used to make nonstick cookware. According to Raiford, other polymers of the same family have been developed with slightly refined structures to offer easier application, more strength or decorative looks to the nonstick surface.
Scientists who take courses at the Alda Center with STRIDE learn how to understand their audience through various role-playing scenarios. They will also develop their abilities to present their goals or messages in a visual way and not just talk about their work.
Within a few years they had automated the methodology (one could now, or so it seemed, load up the instrument with reagents and a computer program defining the amino acid sequence desired and retire for the night) and the Merrifield method soon swept all before it. A pinnacle was reached in 1971 in Merrifield's own laboratory with the complete synthesis of the enzyme ribonuclease, which contains 124 amino acids of which the sequence had been determined by Moore and Stein, and a demonstration of its acquisition of full biological activity. The opposition was gradually silenced. One of Merrifield's colleagues, Richard DiMarchi, is quoted as saying: "He answered his critics with data and dignity."
It was not until five years ago, in a conversation with Professor Alick Bearn, the then Executive Director of the American Philosophical Society and a former colleague of Merrifield and Woolley at Rockefeller University, that the answer to the first question came. Woolley, as I was told, suffered from severe diabetes and lost his vision shortly after Merrifield's arrival from the West Coast. But, undaunted, he continued with his experimental work. One of his habits was to work at night, and when the cleaners would arrive in the morning and turned on the lights they were alarmed to see Woolley at his bench. 2ff7e9595c
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