Chemistry

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

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Approximately how many chemicals are in a cup of coffee?
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What is the chemical symbol for Helium?
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Which of these molecules are not planar?
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What element forms about 78% of Earth's atmosphere by volume?
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Which type of matter has definite volume but no definite shape?
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What do cooks use to tell when meat is done?
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What is a combination of substances that still remain intact?
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Which of the following words mean "made stronger"?
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