Chemistry

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

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Who is considered the "father" of organic chemistry?
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When cutting onions what is released in the air that makes a person tear?
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Which of these is an element?
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Which of the following is used as a rating scale to grade gasoline?
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Which of the following is an element?
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What symbol appears on the periodic table for the element with the atomic number 92?
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What is the spontaneous decay of atomic nuclei known as?
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What process changes a rock's chemical composition to break it down?
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