StudyGuideandAnswerKeyforUnit2Assessment - ModifiedTrue\/False .Iffalse, true 1 2 3

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Unformatted text preview: Biology A Study Guide for Unit 2 Assessment Modified True/False Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true. ____ 1. Atoms have a positive charge. _________________________ ____ 2. Electrons have very little mass. _________________________ ____ 3. Molecules are atoms that have gained or lost one or more electrons. _________________________ ____ 4. A covalent bond forms between two atoms that share electrons to form a molecule. _________________________ ____ 5. Water molecules attract nonpolar molecules such as oil. _________________________ ____ 6. The ability of water to retain heat helps cells maintain a constant internal temperature. _________________________ ____ 7. The role of carbohydrates in cells is to supply energy. _________________________ ____ 8. When cells break down food, the energy from the food is temporarily stored as ATP. _________________________ ____ 9. The amount of energy needed to cause a chemical reaction to start is called activation energy. _________________________ ____ 10. Without enzymes, chemical reactions necessary for life would not occur quickly or easily enough to sustain life. _________________________ ____ 11. When an enzyme binds with its substrate, the activation energy needed for the chemical reaction to occur is increased. _________________________ Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 12. Atoms are not composed of a. protons. c. electrons. b. neutrons. d. chemical bonds ____ 13. The smallest particle of matter that can retain the chemical properties of carbon is a carbon a. molecule. c. atom. b. macromolecule. d. element. ____ 14. A substance that is composed of only one type of atom is called a(n) a. compound. c. element. b. cell. d. molecule. ____ 15. Sharing of electrons in the outer energy levels of two atoms a. results in ion formation. b. makes both atoms stable. c. only occurs if both are atoms of the same element. d. is found only among carbon atoms. ____ 16. A molecule that has a partial positive charge on one side and a partial negative charge on the other side is called a(n) a. nonpolar molecule. c. charged molecule. b. polar molecule. d. ion. ____ 17. When placed in the same container, oil and water do not mix because a. they are both polar. c. they are both nonpolar. b. water is polar and oil is nonpolar. d. water is nonpolar and oil is polar. ____ 18. Acidic solutions have a pH that is a. less than 7. c. a negative number. b. between 7 and 14. d. more than 7. ____ 19. Which of the following is not a large biomolecule? a. carbohydrate c. lipid b. ice d. nucleic acid ____ 20. The building blocks of most biomolecules contain the element a. carbon. c. calcium. b. nitrogen. d. sodium. Molecule A Molecule B ____ 21. Refer to the illustration above. Molecule A is a a. carbohydrate. c. nucleic acid. b. lipid. d. protein. ____ 22. ____ 23. ____ 24. ____ 25. ____ 26. ____ 27. ____ 28. ____ 29. Which of the following is a carbohydrate? a. ATP c. wax b. steroid d. sucrose All of the following are examples of lipids except a. oil. c. steroids. b. starch. d. candle wax. Which of the following molecules are most closely related to proteins? a. amino acids c. nucleotides b. monosaccharides d. sugars The amino group of one amino acid is linked to the carboxyl group of another amino acid in a protein. This link is a(n) a. peptide bond. c. ionic bond. b. hydrogen bond. d. polar bond. What gives each amino acid its unique properties? a. its side group c. its carboxyl group b. its amino group d. its sequence The two types of nucleic acids are a. RNA and ATP. c. DNA and ATP. b. DNA and RNA. d. nucleotides and ATP. The law of conservation of energy states that energy cannot be a. changed from one form to another. b. taken from the surroundings in a reaction. c. released into the surroundings in a reaction. d. created or destroyed in a chemical reaction. Refer to the illustration above. Which of the following statements regarding the graph is true? a. Reaction 2 occurs faster than Reaction 3 because Reaction 2 requires more energy than Reaction 3. b. The difference between the graphs shown for Reaction 2 and Reaction 3 occurs because of a difference in the activation energy of these reactions. c. Reactant A contains more energy at the beginning of the reaction than product C has at the end of the reaction. d. Product B contains more energy at the end of the reaction than reactant A has at the beginning of the reaction. ____ 30. Refer to the illustration above. Reaction 3 in the graph a. probably occurred in the presence of an enzyme. b. requires more activation energy than Reaction 2. c. is the same as Reaction 1, but faster. d. is slower than Reaction 2. Completion Complete each statement. 31. The ability to move or change matter is ____________________. 32. All living things require a source of ____________________ to carry out their life activities. 33. The energy needed to start a chemical reaction is called ____________________. 34. The portion of an enzyme molecule into which a specific substrate can fit is called the ____________________. Problem 35. Refer to the illustration above. The graph depicts the relative energy levels of the products and reactants for the following chemical reaction: A + B ↔ C + D. a. Which substances, A, B, C, and/or D, are present at point 1 on the graph? b. Which substances, A, B, C, and/or D, are present at point 3 on the graph? c. Why is point 2 at a higher energy level than point 1? d. Why is point 3 at a lower energy level than point 1? e. Draw a dashed line on the graph indicating how the energy level of this reaction over time would be different if the enzyme that catalyzes the reaction were not present. Biology A Study Guide for Unit 2 Assessment Answer Section MODIFIED TRUE/FALSE 1. ANS: F, neutral PTS: 1 2. ANS: T OBJ: 3.1.1 3. ANS: F, Ions PTS: 1 4. ANS: T OBJ: 3.1.2 5. ANS: F, repel PTS: 1 6. ANS: T OBJ: 3.2.1 7. ANS: T OBJ: 3.3.2 8. ANS: T OBJ: 3.3.5 9. ANS: T OBJ: 3.4.2 10. ANS: T OBJ: 3.4.3 11. ANS: F, decreased PTS: 1 MULTIPLE CHOICE 12. ANS: D STA: 3.4.10.A.1 DIF: I OBJ: 3.1.1 PTS: 1 DIF: I OBJ: 3.1.2 PTS: 1 DIF: II DIF: II DIF: I OBJ: 3.1.3 | 3.2.2 PTS: 1 DIF: II PTS: 1 DIF: II PTS: 1 DIF: II PTS: 1 DIF: I PTS: 1 DIF: II DIF: II OBJ: 3.4.3 PTS: 1 DIF: II OBJ: 3.1.1 13. ANS: STA: 14. ANS: STA: 15. ANS: STA: 16. ANS: STA: 17. ANS: STA: 18. ANS: STA: 19. ANS: STA: 20. ANS: STA: 21. ANS: STA: 22. ANS: STA: 23. ANS: STA: 24. ANS: STA: 25. ANS: STA: 26. ANS: STA: 27. ANS: STA: 28. ANS: STA: C 3.4.10.A.9 PTS: 1 DIF: II OBJ: 3.1.1 C 3.4.10.A.1 PTS: 1 DIF: I OBJ: 3.1.1 B 3.4.10.A.5 PTS: 1 DIF: III OBJ: 3.1.2 B 3.4.10.A.5 PTS: 1 DIF: I OBJ: 3.1.3 B 3.4.10.A.5 PTS: 1 DIF: II OBJ: 3.1.3 | 3.2.2 A 3.4.10.A.6 PTS: 1 DIF: I OBJ: 3.2.2 B 3.4.10.A.6 PTS: 1 DIF: II OBJ: 3.3.1 A 3.4.10.A.9 PTS: 1 DIF: III OBJ: 3.3.1 A 3.4.10.A.5 PTS: 1 DIF: II OBJ: 3.3.2 D 3.4.10.A.1 PTS: 1 DIF: I OBJ: 3.3.2 B 3.4.10.A.1 PTS: 1 DIF: II OBJ: 3.3.3 A 3.4.10.A.9 PTS: 1 DIF: III OBJ: 3.3.4 A 3.4.10.A.5 PTS: 1 DIF: II OBJ: 3.3.4 A 3.4.10.A.1 PTS: 1 DIF: II OBJ: 3.3.4 B 3.3.10.C.7 PTS: 1 DIF: I OBJ: 3.3.5 D 3.3.10.b4 PTS: 1 DIF: II OBJ: 3.4.1 29. ANS: B PTS: 1 DIF: III OBJ: 3.4.2 STA: 3.4.10.b1 30. ANS: A PTS: 1 DIF: III OBJ: 3.4.3 STA: 3.4.10.b1 COMPLETION 31. ANS: energy PTS: 1 DIF: I OBJ: 3.4.1 STA: 3.4.10.b3 32. ANS: energy PTS: 1 DIF: II OBJ: 3.4.1 STA: 3.4.10.b3 33. ANS: activation energy PTS: 1 DIF: I OBJ: 3.4.2 STA: 3.3.10.b4 34. ANS: active site PTS: 1 DIF: I OBJ: 3.4.3 STA: 3.4.10.b3 PROBLEM 35. ANS: a. A and B b. C and D c. An input of energy, called the activation energy, is required in order to get the reaction going. d. The products contain less energy than the reactants, and energy is given off in the reaction. e. The graph should be the same except that the energy level at point 2 would be higher. PTS: 1 DIF: III OBJ: 3.4.2 | 3.4.3 STA: 3.4.10.b3 ...
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  • Spring '16
  • brennen
  • pts, d., OBJ

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