chpt. 2 review Name: Class: Date: Multiple Choice Identify the choice that best completes the statement or answers the question.
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1 Name: Class: Date: chpt. 2 review Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Subatomic particles are a. particles that are smaller than an atom. b. made up of a single atom. c. particles found beneath atoms. d. composed of several atoms. 2. A substance with a ph of 6 is called a. an acid. b. a base. c. water. d. a suspension. 3. What kinds of atoms are bonded to carbon atoms in the molecule shown? a. helium, oxygen, and nitrogen b. calcium, hydrogen, and oxygen c. hydrogen, oxygen, and nitrogen d. helium, carbon, and sodium 4. When hydrogen and oxygen combine to form water, water is a. a product. b. a reactant. c. an enzyme. d. a catalyst. 5. An enzyme serves as a place where a chemical reaction can occur because a. the enzyme is a substrate. b. the enzyme is one of the reactants in the reaction. c. the charge on the enzyme's active site is the same as the charge on the substrates. d. the shape of the substrates fits perfectly into the shape of the enzyme's active site. 6. An enzyme acts as a catalyst to a chemical reaction by a. lowering the activation energy needed to get the reaction started. b. making one of the substrates needed for the reaction. c. regulating the temperature at which the reaction takes place. d. regulating the ph at which the reaction takes place. 1
2 Name: 7. An atom of calcium contains 20 protons. How many electrons does it have? a. 40 b. 10 c. 40 d Carbon-12 and carbon-14 are isotopes of carbon. What is different in their atomic structure? a. Carbon-12 has 6 protons and carbon-14 has 8 protons. b. Carbon-12 has 6 neutrons and carbon-14 has 8 neutrons. c. Carbon-12 has 6 electrons and carbon-14 had 8 electrons. d. Carbon-12 has 6 neutrons and carbon-14 has 7 neutrons. 9. What two types of bonds hold the atoms within a compound together? a. Ionic and covalent b. Adhesion and polar c. Isotopes and metallic 10. What feature makes a water molecule polar? a. It has an overall negative charge. b. It has an overall positive charge. c. It has a slightly negative charge that causes it to be attracted to other atoms on one end. d. It has a slightly negative charge at one end and a slightly positive charge at the other end. 11. Why is water such a good solvent? a. It is a universal substance. b. It has polarity. c. It is made of only two elements. 12. What determines whether a solution is an acid or a base? a. The concentration of hydrogen ions b. The concentration of oxygen ions c. The concentration of hydroxide ions d. The concentration of sodium ions 13. Which of the following describes the four major groups of biomolecules found in living things? a. Carbohydrates, lipids, nucleic acids, and proteins b. Carbohydrates, amino acids, proteins, and nitrogen bases c. Carbohydrates, monomers, polymers, and proteins 2
3 Name: 14. The diagram shows a structural formula of a biomolecule. What is the most likely function of this biomolecule? a. Storing energy b. Fighting diseases c. Storing genetic information d. Forming waterproof coverings 3
4 chpt. 2 review Answer Section MULTIPLE CHOICE 1. ANS: A PTS: 1 DIF: L2 OBJ: Identify the three subatomic particles found in atoms. STA: Bio.9A TOP: PE_ML_BIO_2014_C2_MC3 2. ANS: A PTS: 1 DIF: L2 OBJ: Explain what acidic solutions and basic solutions are. STA: Bio.9A TOP: PE_ML_BIO_2014_C2_MC25 BLM: application 3. ANS: C PTS: 1 DIF: L2 OBJ: Describe the unique qualities of carbon. STA: Bio.9A TOP: PE_ML_BIO_2014_C2_MC28 BLM: analysis 4. ANS: A PTS: 1 DIF: L2 OBJ: Explain how chemical reactions affect chemical bonds. STA: Bio.9A TOP: PE_ML_BIO_2014_C2_MC35 BLM: application 5. ANS: D PTS: 1 DIF: L2 OBJ: Explain why enzymes are important to living things. STA: Bio.9C TOP: PE_EN_TX_BIO_2014_TB_ ANS: A PTS: 1 DIF: L1 OBJ: Explain why enzymes are important to living things. STA: Bio.9C TOP: PE_EN_TX_BIO_2014_TB_ ANS: D PTS: 1 DIF: L1 OBJ: Identify the three subatomic particles found in atoms. STA: Bio.9A TOP: PE_EN_TX_BIO_2014_TB_ ANS: B PTS: 1 DIF: L2 OBJ: Explain how all of the isotopes of an element are similar and how they are different. STA: Bio.9A TOP: PE_EN_TX_BIO_2014_TB_ ANS: A PTS: 1 DIF: L1 OBJ: Describe the two main types of chemical bonds. STA: Bio.9A TOP: PE_EN_TX_BIO_2014_TB_ ANS: D PTS: 1 DIF: L2 OBJ: Discuss the unique properties of water. STA: Bio.9A TOP: PE_EN_TX_BIO_2014_TB_ ANS: B PTS: 1 DIF: L1 OBJ: Differentiate between solutions and suspensions. STA: Bio.9A TOP: PE_EN_TX_BIO_2014_TB_ ANS: A PTS: 1 DIF: L1 OBJ: Explain what acidic solutions and basic solutions are. STA: Bio.9A TOP: PE_EN_TX_BIO_2014_TB_ ANS: A PTS: 1 DIF: L2 OBJ: Describe the structures and functions of each of the four groups of biomolecules. STA: Bio.9A TOP: PE_EN_TX_BIO_2014_TB_
5 14. ANS: A PTS: 1 DIF: L3 OBJ: Describe the structures and functions of each of the four groups of biomolecules. STA: Bio.9A TOP: PE_EN_TX_BIO_2014_TB_ BLM: analysis 2
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