Chemistry

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

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What was Avogadro's number?
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What is the chemical term for a peptide; two amino acids linked together?
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What is the abbreviation for an element called?
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Phosphorous on the periodic table is noted by which symbol?
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Praseodymium on the periodic table is noted by which symbol?
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Reacting an organic acid with a primary alcohol yields which of the following products?
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What element, used in some types of paint, created a health risk to children who ate paint chips?
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What chemical substance is abbreviated CO2?
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