Chemistry

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

More Questions from Chemistry
What are chemicals that reduce or prevent oxidation called?
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What is the symbol used on the periodic table for the element Boron?
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What are the main two elements that undergo fusion to power the sun?
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Which element has Na as its chemical symbol?
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What is often used in advertising signs and produces a bright reddish-orange light?
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What is the unit defined as the energy needed to raise one gram of water by 1 degree Celsius?
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What's the chemical symbol for water?
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Carbon Dioxide, often given off in a fire, is comprised of what?
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