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Biology 109: Fundamentals of Biology Chapter 2 Questions – Look at chemistry notes (may involve previewing material) 1. Iron is an important element in human body cells. If iron has an atomic number of 26 and atomic mass of 56, what does this tell you about the number of protons, electrons and neutrons? Protons = Electrons = 26 Neutrons = 56-26= 30 2. An atom's nucleus is composed of _ protons ___ and is surrounded by the _ neutrons_ ______. 3. Atoms or molecules that have gained or lost electrons are called __ ion ___. 4. Milk of magnesia is often used to treat stomach upset. It has a pH of 10. Based on this information, milk of magnesia is a(n) __ alkaline_ __________________. 5. What is the difference between covalent and ionic bonds? Ionic is transfer of electrons Covalent is sharing of electrons 6. Surface tension and adhesion are properties of water that are due to what type of chemical bond? - Hydrogen bond 7. Which biological molecules contain genetic information? -Nucleic acids
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