Test Bank for Anatomy & Physiology The Unity of Form and Function 8th Edition by Saladin, Kenneth S
Chapter 02 The Chemistry of Life Answer Key
True / False Questions
1. |
Minerals are organic elements extracted from the soil by plants. FALSE |
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2. |
Molecules composed of two or more atoms are called compounds. FALSE |
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3. |
Hydrogen, deuterium, and tritium are three isotopes of hydrogen. TRUE |
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4. |
Potassium, sodium, and chlorine are trace elements. FALSE |
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5. |
Ionic bonds break apart in water more easily than covalent bonds do. TRUE |
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6. |
A solution is a mixture of two or more substances that are physically blended but not chemically combined. TRUE |
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7. |
The pH of blood plasma is approximately 7.4, which is slightly acidic. FALSE |
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8. |
The high heat capacity of water makes it a very ineffective coolant. FALSE |
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9. |
In an exchange reaction, covalent bonds are broken and new covalent bonds are formed. TRUE |
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10. |
Chemical reactions in which larger molecules are broken down into smaller ones are called catabolic reactions. TRUE |
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11. |
The opposite of a dehydration synthesis reaction is a hydrolysis reaction. TRUE |
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12. |
Unsaturated fatty acids have as much hydrogen as they can carry. FALSE |
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13. |
A dipeptide is a molecule with two peptide bonds. FALSE |
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14. |
All amino acids have both a carboxyl group and an amino group attached to a central carbon. TRUE |
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15. |
ATP is the body’s most important form of long-term energy storage. FALSE |
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Multiple Choice Questions
16. |
The most abundant element in the human body, by weight, is __________. A. nitrogen B. hydrogen C. carbon D. oxygen E. calcium |
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17. |
Sodium has an atomic number of 11 and an atomic mass of 23. Sodium has __________. A. 12 neutrons and 11 protons B. 12 protons and 11 neutrons C. 12 electrons and 11 neutrons D. 12 protons and 11 electrons E. 12 electrons and 11 protons |
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18. |
The chemical properties of an atom are determined by its __________. A. protons B. electrons C. neutrons D. protons and neutrons E. particles |
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19. |
Na (atomic no. 11) reacts with Cl (atomic no. 17) to become stable. In the reaction, Na will ____________, while Cl will ____________. A. accept one electron; give up one electron B. give up one proton; accept one proton C. share one electron with chlorine; share one electron with sodium D. become an anion; become a cation E. give up one electron; accept one electron |
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20. |
Oxygen has an atomic number of 8 and an atomic mass of 16. How many valence electrons does it have? A. 2 B. 4 C. 6 D. 8 E. 16 |
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