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BSC 1005 Post-Exam 1 Review Fall 2011 Introduction to Life Science BSC 1005 Fall 2011 Post-Exam 1 Review Name _________________________________________ CRN _________________________________________ Due Date _____Tues, 10/18/11____________________ 1.The scientific process involves a. the acceptance of all hypotheses. b. the acceptance of only data consistent with the hypothesis. c. rejection of hypotheses that are inconsistent with experimental results. d. the acceptance of hypothesis as a fact after subsequent confirmation with experimental results. Explanation:____________________________________________________________ ______________________________________________________________________ 2.What happens to a Nitrogen atom if it looses a proton? a. it becomes a nitrogen isotope b. it becomes a nitrogen anion c. it becomes a nitrogen cation d. it becomes a carbon ion Explanation:____________________________________________________________ ______________________________________________________________________ 3.A hydroxide ion (-OH) has an oxygen atom, a hydrogen atom, and a. an extra electron. b. one less electron. c. an extra proton. d. an extra neutron. Explanation:____________________________________________________________ ______________________________________________________________________ 1 BSC 1005 Post-Exam 1 Review Fall 2011 4.A hydrogen ion (H+) is composed of a. a single electron. b. a single proton. c. a proton and an electron. d. two protons and an electron. Explanation:____________________________________________________________ ______________________________________________________________________ 5.The bond formed between column 1 atoms and column 7 atoms of the periodic table. a. ionic. b. covalent. c. hydrogen. d. polar. Explanation:____________________________________________________________ ______________________________________________________________________ 6.Which of the following bonds is the most polar covalent bond? a. H―O b. H―N c. H―C d. cannot determine from the information provided Explanation:____________________________________________________________ ______________________________________________________________________ 7.Potassium(K) has an atomic number of 19 and is located in the first column of the periodic table. Bromine has an atomic number of 35 and is located in the seventh column of the periodic table. Given this information, the correct chemical formula for potassium bromide is: a. KBr. b. K2Br. c. KBr2. d. K2Br2. Explanation:____________________________________________________________ ______________________________________________________________________ 2 BSC 1005 Post-Exam 1 Review Fall 2011 8.Which kind of attractive force holds two molecules together? a. ionic bond b. hydrogen bond c. covalent bond d. sticky bond Explanation:____________________________________________________________ ______________________________________________________________________ 9.Which of the following bonds is the most polar covalent bond? a. H―N b. H―O c. H―C d. cannot determine from the information provided Explanation:____________________________________________________________ ______________________________________________________________________ 10.Which of the following is an acid? a. K2SO4 b. NaOH c. KOH d. H2SO4 Explanation:____________________________________________________________ ______________________________________________________________________ 11.Which of the following molecules contains double bonds. a. C2H4 b. H2O c. HCl d. C3H8 Explanation:____________________________________________________________ ______________________________________________________________________ 3 BSC 1005 Post-Exam 1 Review Fall 2011 12.How many water molecules are produced during the formation of a triglyceride? a.1 b.3 c.5 d.9 Explanation:____________________________________________________________ ______________________________________________________________________ 13.Fructose, glucose, and galactose all have the same empirical formula, C6H12O6, yet these monosaccharides all have different functions. This is possible because these three molecules are a.ions. b.isotopes. c.isomers. d.the same molecule with several common names. Explanation:____________________________________________________________ ______________________________________________________________________ 14.Which of the following best describes the Primary structure of a protein? a.The 3-D folding the polypeptide chain b.Determined by the DNA genetic code c.Multiple polypeptides coming together d.Alpha helix Explanation:____________________________________________________________ ______________________________________________________________________ 15.Denaturation is the process in which a protein loses its native shape and function due to a change in its environment. Which of the following levels of protein structure is lost first as a protein begins to denature? a.Primary b.Secondary c.Tertiary d.Quaternary Explanation:____________________________________________________________ ______________________________________________________________________ 4 BSC 1005 Post-Exam 1 Review Fall 2011 16.Which of the following represents a dehydration synthesis reaction a.C12H22O11 + H2O → 2C6H12O6 b.2C6H12O6 → C12H22O11 + H2O c.HCl + NaOH → NaCl + H2O d.C6H12O6 + 6O2 → 6CO2 + 6H2O Explanation:____________________________________________________________ ______________________________________________________________________ 17.Which of the following represents a hydrolysis reaction a.C12H22O11 + H2O → 2C6H12O6 b.2C6H12O6 → C12H22O11 + H2O c.HCl + NaOH → NaCl + H2O d.C6H12O6 + 6O2 → 6CO2 + 6H2O Explanation:____________________________________________________________ ______________________________________________________________________ 18.Which of the following represents an acid/base reaction a.C12H22O11 + H2O → 2C6H12O6 b.2C6H12O6 → C12H22O11 + H2O c.HCl + NaOH → NaCl + H2O d.C6H12O6 + 6O2 → 6CO2 + 6H2O Explanation:____________________________________________________________ ______________________________________________________________________ 19.The most important function for monosaccharides: a.They form structural molecules b.They are broken down into simple sugars for energy c.They are oxidized for energy producing CO2 d.They are a stored form of energy in cells Explanation:____________________________________________________________ ______________________________________________________________________ 5 BSC 1005 Post-Exam 1 Review Fall 2011 20.DNA is double-stranded. What force holds the two complimentary strands together? a.hydrogen bonds b.covalent bonds c.3’-5’ phosphodiester linkages d.hydrophobic/hydrophilic interactions Explanation:____________________________________________________________ ______________________________________________________________________ 21.DNA’s ability to replicate depends on this property of DNA molecule a.complementary strands b.double helical shape c.the order of the nitrogenous bases d.antiparallel strands Explanation:____________________________________________________________ ______________________________________________________________________ 22.Compared with a pH of 6, a solution of pH 4 has a. 1/100 of the proton concentration. b. 2/3 of the proton concentration. c. 100 times the proton concentration. d. 1,000 times the proton concentration. Explanation:____________________________________________________________ ______________________________________________________________________ 23.List the four classes of organic (biological) molecules: a. ________________________________________ b. ________________________________________ c. ________________________________________ d. ________________________________________ 6 BSC 1005 Post-Exam 1 Review Fall 2011 24.Identify the following molecules as one of the following and circle and label the functional groups on each: a.Triglyceride d.Amino acid b.Saturated fatty acid e.Phospholipid c.Unsaturated fatty acid f.Carbohydrate A. _____ C. _____ E. _____ B. _____ D. _____ F. _____ 7 BSC 1005 Post-Exam 1 Review Fall 2011 25.Which of the following graphs represents a buffered acidic solution? a. b. c. d. Explanation:____________________________________________________________ ______________________________________________________________________ 26.Use the periodic table to solve: Element Atomic Symbol Atomic Number # of Valence Electrons # of electrons required to fill valence shell Carbon Hydrogen Oxygen Nitrogen Phosphorous 8 BSC 1005 Post-Exam 1 Review Fall 2011 27.Circle the all of the peptide bonds: Explanation:____________________________________________________________ ______________________________________________________________________ 9