Unit 3 Chemistry of Life Multiple Choice Identify the choice that best completes the statement or answers the question 1 Which of the following makes up a molecule of water a one atom of hydrogen and one atom of oxygen b one atom of sodium and one atom of chlorine one atom of hydrogen and two atoms of oxygen d two atoms of hydrogen and one atom of oxygen C 2 Ice floats on water because a of cohesion b ice has a higher density than water 3 Water molecules are polar with the a oxygen side being slightly positive and the hydrogen side being slightly negative b oxygen and hydrogen sides being slightly positive c oxygen and hydrogen sides being slightly negative d oxygen side being slightly negative and the hydrogen side being slightly positive 4 22 a b 4 30 4 A map of eastern North America showing the pH of rainfall in the various states indicates that the pH of rain in New York State varies from 4 22 to 4 40 According to these figures the most acidic rainfall in New York State has a pH of 5 Nucleotide is to DNA as a fat is to lipid b amnio acid is to RNA 6 A monosaccharide is a a carbohydrate b lipid water shrinks when it freezes d water expands when it freezes a b lipids Mac a b help to fight disease C control the rate of reactions d build tissues such as muscle egonin c 4 35 d 4 40 c monosaccharide is to fat d monosaccharide is to starch i moda demin 1 7 Which of the following organic compounds is the main source of energy for living things carbohydrates negovia c 6 nucleic acids d proteins to mot silt big c nucleic acid protein 8 Which of the following is NOT a function of proteins store and transmit genetic information ca 9 Which statement is true a Simple sugars are made of polysaccharides Glycerol is made of fatty acids b C RNA molecules are made of nucleotides d Amino acids are made of proteins com