The nucleus of an atom contains protons and _______________.
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Q22: A molecule with the molecular formula CH2O
Q23: _ are lipid molecules arranged in rings.
Q24: _ molecules have nitrogen in their backbone.
Q25: Physiologically important ions are called trace elements.
Q26: Enzymes can only take particular substrates through
Q28: A molecule that will mix with water
Q29: Cellular respiration requires both glucose and _.
Q30: Water has hydrogen bonds, which give it
Q31: _ molecules may be used for energy
Q32: To digest food your body needs special
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