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Q. Glucose (C6H12O6) can survive as both an open-chain form and a closed-ring form. Before 1900, glucose was only thought to happen as an open chain. Now we know that over 99 percent of the time, glucose occurs in the closed-ring form. What probable difference between these forms would give chemists a clue that the open-chain form was not present?
a) Open-chain molecules could form polymers and glucose does not.
b) Only open-chain forms might undergo condensation, which does not happen with glucose.
c) An open chain presents ends with functional groups (in this case aldehyde), and glucose failed to undergo typical aldehyde reactions; phenomenon that could be explained by having no end functional group in a ring structure.
d) Since glucose is solid at room temperature, it should have saturated hydrocarbon chains.
e) Glucose might not be "denatured" so it must be a tight chain.
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Your friend is trying to generate an in vitro system for studying the formation of COPII vesicles. He finds that to get well-organized vesicle budding from artificial membranes, he needs to add the coat proteins, the Sar1 GTP-binding protein.
Acetylcholine acts at the G-protein-linked receptor on heart muscle to make the heart beat more slowly by the effect of the G protein on a K+ channel. Which one or more of next would enhance this effect of acetylcholine.
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The oldest rocks on Earth date from about 4.2 billion years ago. What does this propose about the interval between 4.6 billion years ago, while the Earth started to form, and 4.2 billion years ago.
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