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Quiz: Scientific Foundations and Chemistry of Life

Test your understanding of Chapter 1 with the following questions.

1. Which subatomic particle determines an atom’s atomic number?

  1. Neutron
  2. Proton
  3. Electron
  4. Positron
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The correct answer is B. Atomic number equals the proton count in the nucleus (Atomic Structure section).

Concept Tested: Atomic number vs. mass number

2. Carbon-14 differs from carbon-12 because carbon-14 has additional __.

  1. Electrons
  2. Protons
  3. Neutrons
  4. Positrons
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The correct answer is C. Isotopes vary in neutron count; protons remain constant (Isotopes section).

Concept Tested: Isotopes and neutron variation

3. Which bond type involves electrons shared unequally due to differing electronegativities?

  1. Nonpolar covalent
  2. Polar covalent
  3. Ionic
  4. Metallic
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The correct answer is B. Polar covalent bonds share electrons unevenly, producing partial charges (Chemical Bonding section).

Concept Tested: Covalent bond polarity

4. Which functional group enables strong hydrogen bonding with water?

  1. Methyl (–CH₃)
  2. Carbonyl (C=O)
  3. Hydroxyl (–OH)
  4. Sulfhydryl (–SH)
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The correct answer is C. Hydroxyl groups readily donate/accept hydrogen bonds (Functional Groups sidebar).

Concept Tested: Functional group polarity

5. A solution has [H⁺] = 1 × 10⁻⁵ M. What is its pH?

  1. 3
  2. 4
  3. 5
  4. 6
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The correct answer is C. pH = –log[H⁺]; –log(10⁻⁵) = 5 (pH practice problems).

Concept Tested: pH calculation from [H⁺]

6. Which property of water explains why lakes resist rapid temperature changes?

  1. Cohesion
  2. Adhesion
  3. Surface tension
  4. High specific heat
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The correct answer is D. Water’s high specific heat allows it to absorb/release heat slowly (Water Properties section).

Concept Tested: Specific heat capacity

7. When CO₂ dissolves in blood, what buffer reaction occurs to resist pH change?

  1. HCO₃⁻ + H⁺ → H₂CO₃
  2. CO₂ + H₂O → H₂CO₃ → H⁺ + HCO₃⁻
  3. H₂CO₃ → CO₂ + H₂O
  4. H⁺ + OH⁻ → H₂O
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The correct answer is B. The carbonic acid/bicarbonate buffer equation shifts to absorb excess H⁺ (Buffer Systems section).

Concept Tested: Bicarbonate buffering reaction

8. Dehydration synthesis differs from hydrolysis because dehydration synthesis __.

  1. Adds water to break polymers
  2. Removes water to form polymers
  3. Increases pH by removing H⁺
  4. Occurs only in lipids
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The correct answer is B. Dehydration removes water to build polymers; hydrolysis adds water to break them (Macromolecule preview).

Concept Tested: Polymer formation vs. breakdown

9. Which macromolecule preview is correctly matched with its primary function?

  1. Carbohydrates → long-term genetic storage
  2. Lipids → membrane structure/hormones
  3. Proteins → quick energy fuel
  4. Nucleic acids → cell wall reinforcement
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The correct answer is B. Lipids form membranes and act as hormones (Macromolecule overview table).

Concept Tested: Macromolecule functions

10. Which statement best describes hydrogen bonding in water molecules?

  1. Nonpolar covalent bonds create symmetrical charge distribution.
  2. Partial charges on oxygen and hydrogen attract neighboring molecules.
  3. Ionic bonds with solutes make water hydrophobic.
  4. Metallic bonds allow conduction of heat.
Show Answer

The correct answer is B. Water’s polarity produces partial charges that form hydrogen bonds (Water structure discussion).

Concept Tested: Hydrogen bonding