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1 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) 1) Which of the following statements about the atom A) It has 12 neutrons in its nucleus. B) It has 6 protons in its nucleus. C) Its atomic weight is 12. D) Its atomic number is 6. E) It has 6 electrons orbiting the nucleus. Table 2.1 C is false? O C H 2) Using the information in Table 2.1, calculate the molecular weight of ethanol, C 2 H 5 OH. A) 33 B) 46 C) 34 D) 96 E) Can't tell 3) Antacids neutralize acid by the following reaction. Identify the salt. Mg(OH)2 + 2HCl MgCl2 + H2O A) HCl B) MgCl2 C) H2O D) Mg(OH)2 E) None of the above 2) 3) 4) Which of the following statements is false? 4) A) Water is a part of a dehydration reaction. B) Water molecules are formed by hydrolysis. C) Salts readily dissolve in water. D) Water freezes from the top down. E) Water is a polar molecule. 5) Which of the following is the type of bond holding and ions in KI? A) Hydrogen bond B) Covalent bond C) Ionic bond 6) Which of the following is the type of bond between molecules of water in a beaker of water? A) Covalent bond B) Ionic bond C) Hydrogen bond 5) 6)

2 7) What is the type of bond holding hydrogen and oxygen atoms in the H 2 O molecule? A) Hydrogen bond B) Ionic bond C) Covalent bond 7) 8) Identify the following reaction: Glucose + Fructose Sucrose + Water 8) A) Exchange reaction B) Hydrolysis reaction C) Ionic reaction D) Reversible reaction E) Dehydration synthesis reaction 9) Identify the following reaction: Lactose + H 2 O Glucose + Galactose 9) A) Hydrolysis reaction B) Exchange reaction C) Dehydration synthesis reaction D) Reversible reaction E) Ionic reaction 10) Identify the following reaction: HCl + NaHC NaCl + C 10) A) Reversible reaction B) Dehydration synthesis reaction C) Hydrolysis reaction D) Exchange reaction E) Ionic reaction 11) Identify the following reaction: OH + O 11) A) Ionic reaction B) Hydrolysis reaction C) Exchange reaction D) Reversible reaction E) Dehydration synthesis reaction 12) Which type of molecule contains the alcohol glycerol? 12) A) Protein B) Lipid C) Nucleic acid D) Carbohydrate 13) Which type of molecule is composed of (CH 2 O) units? 13) A) Carbohydrate B) Lipid C) Protein D) Nucleic acid 14) Which type of molecule contains groups? 14) A) Protein B) Lipid C) Carbohydrate D) Nucleic acid 15) Which type of molecule NEVER contains a phosphate group? 15) A) Protein B) Carbohydrate C) Nucleic acid D) Lipid 16) Which of

3 the followin g statemen ts about the atom 16) O is false? A) It has 8 neutrons in its nucleus. B) It has 8 protons in its nucleus. C) It has 8 electrons in its nucleus. D) Its atomic number is 8. E) Its atomic weight is 16. Table 2.1 O C H 17) Using the information in Table 2.1, calculate the number of moles in 92 grams of ethanol, C 2 H 5 OH. A) 1 B) 2 C) 3 D) 4 E) Can't tell 18) The following chemical reaction is used to remove chlorine from water. What type of reaction is it? HClO + Na2SO3 Na2SO4 + HCl A) Dehydration synthesis reaction B) Reversible synthesis reaction C) Exchange synthesis reaction D) Ionic synthesis reaction E) Hydrolysis synthesis reaction 17) 18) 19) Which of the following pairs is mismatched? 19) A) HF H+ + F- acid B) MgSO 4 Mg2+ + SO 4 2- salt C) H 2 SO 4 2H+ + SO 4 2- acid D) KH 2 PO 4 K+ + H2PO 4 - acid E) NaOH Na+ + OH- base Table 2.2 Refer to these reactions to answer the question below.

4 20) Which of the following statements about the reactions in Table 2.2 is false? A) They occur when the reactants are dissolved in water. B) They are dissociation reactions. C) They are ionization reactions. D) They are exchange reactions. E) They are reversible reactions. 21) What is the type of bond between the hydrogen of one molecule and the nitrogen of another molecule? A) Covalent bond B) Hydrophobic bond C) Ionic bond D) Hydrogen bond E) Disulfide bond 22) What is the type of bond between carbon, hydrogen, and oxygen atoms in organic molecules? A) Covalent bond B) Ionic bond C) Hydrogen bond 20) 21) 22) 23) What is the type of bond between ions in salt? 23) A) Hydrogen bond B) Covalent bond C) Ionic bond 24) Identify the following reaction: O + 24) A) Dehydration synthesis reaction B) Reversible reaction C) Exchange reaction D) Hydrolysis reaction E) Covalent reaction 25) Identify the following reaction: Glycine + Lysine Dipeptide + H 2 O 25) A) Hydrolysis reaction B) Covalent reaction C) Reversible reaction D) Exchange reaction E) Dehydration synthesis reaction 26) Identify the following reaction: Sucrose + O Glucose + Fructose 26) A) Dehydration synthesis reaction B) Exchange reaction C) Covalent reaction

5 D) Hydrolysis reaction E) Reversible reaction 27) Structurally, ATP is most like which type of molecule? 27) A) Protein B) Carbohydrate C) Nucleic acid D) Lipid 28) What do genes consist of? 28) A) Carbohydrates B) Proteins C) Nucleic acids D) Lipids 29) Which molecule is composed of a chain of amino acids? 29) A) Lipid B) Nucleic acid C) Carbohydrate D) Protein 30) Which are the primary molecules making up plasma membranes in cells? A) Carbohydrates B) Nucleic acids C) Proteins D) Lipids 31) The antimicrobial drug imidazole inhibits sterol synthesis. This would most likely interfere with A) Eukaryotic plasma membranes. B) Fungal cell walls. C) Genes. D) Prokaryotic plasma membranes. E) Bacterial cell walls. 30) 31) Figure ) In Figure 2.1, which is an alcohol? 32) A) a B) b C) c D) d E) e 33) Which compound in Figure 2.1 is an ester? 33) A) a B) b C) c D) d E) e 34) Which compound in Figure 2.1 is an organic acid? 34) A) a B) b C) c D) d E) e Figure 2.2

6 35) Use Figure 2.2 to answer the following question. Archaea differ from bacteria in the composition of the cell membrane lipids. Archaea have ether-bonded lipids, shown in part of Figure 2.2, and bacteria have ester-bonded lipids, shown in part of Figure 2.2. A) c; d B) b; a C) d; c D) b; c E) a; d 35) Figure ) What kind of bond is at the arrow in Figure 2.3? 36) A) Hydrogen bond B) Single covalent bond C) Ionic bond

7 D) Double covalent bond E) Peptide bond Figure ) What kind of bond is at the arrow in Figure 2.4? 37) A) Disulfide bridge B) Peptide bond C) Hydrogen bond D) Ionic bond E) Double covalent bond 38) An E. coli culture that has been growing at 37 C is moved to 25 C. Which of the following changes must be made in its plasma membrane? A) The viscosity must increase. B) The number of saturated chains must increase. C) The number of unsaturated chains must increase. D) The number of phosphate groups must increase. E) No changes are necessary. 39) Assume Saccharomyces cerevisiae is grown in a nutrient medium containing the radioisotope 35S. After a 48-hour incubation, the 35S would most likely be found in the S. cerevisiae's A) Carbohydrates. B) Water. C) Nucleic acids. D) Lipids. E) Proteins. 40) Assume Saccharomyces cerevisiae is grown in a nutrient medium containing the radioisotope 32P. After a 48-hour incubation, the 32P would most likely be found in the S. cerevisiae's A) Carbohydrates. B) Water. C) Cell wall. D) Proteins. E) Plasma membrane. 38) 39) 40) 41) Starch, dextran, glycogen, and cellulose are polymers of 41) A) Glucose.

8 B) Amino acids. C) Fatty acids. D) Acids. E) Nucleic acids. 42) Which of the following is a base? 42) A) NaOH Na+ + OH- B) H 2 CO C) C 2 H 5 OH D) C2 H 5 OCOOH H+ + C 2 H 5 OCO E) H 2 O H+ + OH- 43) Two glucose molecules are combined to make a maltose molecule. What is the chemical formula for maltose? A) C 12 H 22 O 11 B) C 12 H 23 O 10 C) C 3 H 6 O 3 D) C 12 H 24 O 12 E) C 6 H 12 O 6 44) Desulfovibrio bacteria can perform the following reaction: S6- S2-. These bacteria are A) Hydrolyzing sulfur. B) Oxidizing sulfur. C) Reducing sulfur. D) Synthesizing sulfur. 45) Oil-degrading bacteria are naturally present in the environment but cannot degrade an oil spill fast enough to avoid ecological damage. How can the actions of these bacteria be sped up? A) Provide oil for them. B) Add NaCl. C) Add water. D) Provide sugar as a carbon source. E) Provide nitrogen and phosphorus. 43) 44) 45) ESSAY. Write your answer in the space provided or on a separate sheet of paper. 46) Describe how the properties of phospholipids make these molecules well suited for plasma membranes. Figure 2.5

9 47) Use Figure 2.5 to answer the following question. Starch, cellulose, dextran, and glycogen are polysaccharides. How are they similar? To what are their different properties due? Why can't an enzyme that hydrolyzes starch degrade cellulose?

10 1) A 2) B 3) B 4) B 5) C 6) C 7) C 8) E 9) A 10) D 11) D 12) B 13) A 14) A 15) B 16) C 17) B 18) C 19) D 20) D 21) D 22) A 23) C 24) C 25) B 26) D 27) C 28) C 29) D 30) D 31) A 32) C 33) D 34) A 35) B 36) A 37) B 38) C 39) E 40) E 41) A 42) A 43) A 44) B 45) E 46) 47)

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