Chemistry

Which of these can take on either a positive or negative charge, typically being a protein?

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What are compounds that contain carbon called?
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What element forms about 78% of Earth's atmosphere by volume?
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Which metal contains 60% copper and 40% zinc?
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Gold, silver, lead, and copper exhibit the properties of which of the following crystal systems?
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What symbol appears on the periodic table for the element with the atomic number 6?
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What is the stinky gas associated with swamps and anaerobic decomposition?
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What is the conversion of sugars in wort to alcohol and carbon dioxide?
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The Sun makes up 99.86% of the mass of what?
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