CHEM_120_Final

CHEM 120 Final Exam Practice Questions 1. Question: (TCO 12) The DNA double helix is _____. (Pts. : 5) made up of two polynucleotide strands composed of adenine and thymine a puzzle to geneticists composed of adenine and guanine composed of two chromosomes 2. Question: (TCO 12) Which of the following best describes the action of enzymes in living systems? A specific enzyme generally catalyzes (Pts. : 5) one specific reaction. a group of similar reactions. many different reactions. either one specific reaction or a group of similar reactions. random reactions. 3. Question: (TCO 12) Which of the following is not an unsaturated fatty acid? (Pts. : 5) CH3CH2CH2CH=CHCOOH CH3CH=CHCH=CHCOOH CH3CH2CH2CH2CH2COOH CH3CH2CH2CH2CH2CH=CHCOOH CH3CH=CHCH2CH=CHCOOH 4. Question: (TCO 12) The primary structure of a protein is determined by (Pts. : 5) the amino-acid composition. the order of amino acids in the protein. the hydrogen bonding that gives the protein a three-dimensional shape. the intertwining of protein molecules to form a “functional” protein. the hydrogen bonds between sulfur atoms on different amino acids. 5. Question: (TCO 12) Which of the following is a disaccharide? (Pts. : 5) Cellulose Starch Ribose Galactose Lactose 6. Question: (TCO 12) Cell nutrients and waste must pass through the (Pts. : 5) nuclear membrane. ribosomes. mitochondria chloroplasts. cell membrane. 7. Question: (TCO 12) Which of the following is a monosaccharide? (Pts. : 5) Mannose Starch Cellulose Glucose Lactose 8. Question: (TCO 4) The best description of the shape of an ammonia molecule is _____. (Pts. : 5) linear pyramidal bent tetrahedral None of the above 9. Question: (TCO 4) Which of the following substances does not have polar covalent bonds? (Pts. : 5) CO2 Br2 CH4 NF3 10. Question: (TCO 8) According to the Bronsted-Lowry definition, which chemical in the following reaction is the acid? NH4+ + H2O - H3O+ + NH3 (Pts. : 5) H3O+ NH4+ NH3 H2O None of the above 11. Question: (TCO 8) According to the Bronsted-Lowry definition, which chemical in the following reaction is the base? HCN + NO2- - CN- + HNO2 (Pts. : 5) HNO2 NO2- HCN CN- None of the above 12. Question: (TCO 2) Match the atom with the appropriate description. (Pts. : 15) Potential Matches: 1 : Nitrogen (N) 2 : Carbon (C) 3 : Boron (B) 4 : Fluorine (F) 5 : Beryllium (Be) Answer : An atom, which has a mass number of 9, with 5 neutrons : An atom, which has a mass number of 11, with 6 neutrons : An atom, which has a mass number of 12, with 6 neutrons : An atom, which has a mass number of 19, with 10 neutrons : An atom, which has a mass number of 14, with 7 neutrons 13. Question: (TCO 10) Match the organic compound with its use or characteristic. (Pts. : 15) Potential Matches: 1 : Component of ant sting 2 : Found in antifreeze 3 : Orange flavor 4 : Propellants 5 : Fishy odor Answer : Octyl acetate : CFCs : Formic acid : Ethylene glycol : Trimethylamine 14. Question: (TCO 9) Match the organic compound with its name. (Pts. : 15) Potential Matches: 1 : Ethanoic acid 2 : 1-propanol 3 : Ethylamine 4 : Heptanal 5 : Pentyl acetate Answer : CH3COOH : CH3CH2CH2CH2CH2CH2CHO : CH3CH2CH2OH : CH3COOCH2CH2CH2CH2CH3 : CH3CH2NH2