Review - Review Review Sheet 4: Atoms, Molecules and Life...

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Review Review Sheet 4: Atoms, Molecules and Life (Chapter2) Keywords acid:  a substance that releases hydrogen ions (H + ) into solution; a solution with a pH of less  than 7. acidic:  with an H +  concentration exceeding that of OH -  ; releasing H + . antioxidant:  any molecule that reacts with free radicals, neutralizing their ability to damage  biological molecules. Vitamins C and E are examples of dietary antioxidants. atom:  the smallest particle of an element that retains the properties of the element. atomic nucleus:  the central part of an atom that contains protons and neutrons. atomic number:  the number of protons in the nuclei of all atoms of a particular element. base:  (1) a substance capable of combining with and neutralizing H +  ions in a solution; a  solution with a pH more than 7; (2) in molecular genetics, one of the nitrogen-containing,  single- or double-ringed structures that distinguish one nucleotide from another. In DNA, the  bases are adenine, guanine, cytosine, and thymine. basic:  with an H +  concentration less than that on OH - ; combining with H + . buffer:  a compound that minimizes changes in pH by reversibly taking up or leasing H +  ions. calorie:  the amount of energy required to raise the temperature of 1 gram of water by 1  degree Celsius. chemical bond: 
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Review - Review Review Sheet 4: Atoms, Molecules and Life...

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