Chemistry

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

More Questions from Chemistry
Which of the following is a compound?
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Analysis of the black soot left over from a fire would reveal what primary element?
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What state of matter takes a shape of its own?
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What kind of cell has a negative EMF and a positive Gibbs free energy?
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What is the chemical combination of silicon and oxygen called?
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What is the sixth most abundant element on Earth, as well as the most abundant alkali metal?
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What is the name of a hydrocarbon with two carbons sp^2 hybridized?
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What element has the highest ionization energy?
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