BIOD 101 Module 3 Exam – Portage Learning Biology (2026) | Actual Questions with Verified Answers | Take & Pass the Exam | Instant Download PDF

BIOD 101 Module 3 Exam – Portage Learning Biology (2026) Actual Questions with Verified Answers | Take
& Pass the Exam


Questions 1–250
Section 1: Metabolism, Energy, and Chemical Reactions (Questions 1–40)


1. Metabolism is defined as:
A) The breakdown of glucose to produce ATP
B) The sum of all synthetic and degradation biochemical reactions in the human body
C) The process of photosynthesis in plants
D) The movement of molecules across a membrane
Answer B: The sum of all synthetic and degradation biochemical reactions in the human body
Rationale: Metabolism encompasses all synthetic (anabolic) and degradative (catabolic) reactions.




2. Anabolism refers to:
A) The sum of all synthetic, energy-requiring biochemical reactions
B) The sum of all energy-releasing degradation reactions
C) The breakdown of macromolecules
D) The process of cellular respiration
Answer A: The sum of all synthetic, energy-requiring biochemical reactions
Rationale: Anabolism builds complex molecules from simpler ones and requires energy.




3. Catabolism refers to:
A) The sum of all synthetic energy-requiring reactions
B) The sum of all energy-releasing degradation biochemical reactions
C) The process of building proteins
D) The storage of energy
Answer B: The sum of all energy-releasing degradation biochemical reactions
Rationale: Catabolism breaks down macromolecules into smaller units, releasing energy.

,4. Which type of chemical reaction requires energy and occurs when two or more monomers are
joined together, resulting in the loss of a water molecule and possibly other small molecules?
A) Hydrolysis
B) Dehydration condensation reaction
C) Redox reaction
D) Oxidation reaction
Answer B: Dehydration condensation reaction
Rationale: Dehydration condensation joins monomers by removing a water molecule (and possibly others)
and requires an energy input.




5. During hydrolysis, a molecule of water is _____ and energy is _____.
A) Gained; released
B) Lost; released
C) Gained; required
D) Lost; required
Answer A: Gained; released
Rationale: Hydrolysis breaks bonds by adding water, releasing energy.




6. Which type of chemical reaction is used to join monomers to form polysaccharides and involves
the loss of only water molecules?
A) Dehydration
B) Hydrolysis
C) Redox
D) Oxidation
Answer A: Dehydration
Rationale: Dehydration reactions join monomers to form polymers, releasing water as the only byproduct.




7. A redox reaction has _____ steps.
A) One
B) Two
C) Three
D) Four
Answer B: Two

,Rationale: A redox reaction involves two steps: oxidation and reduction.




8. The first step of a redox reaction is:
A) Oxidation
B) Reduction
C) Hydrolysis
D) Dehydration
Answer A: Oxidation
Rationale: Oxidation is the loss of electrons, which is the first step in a redox reaction.




9. The second step of a redox reaction is:
A) Oxidation
B) Reduction
C) Hydrolysis
D) Dehydration
Answer B: Reduction
Rationale: Reduction is the gain of electrons, which is the second step.




10. OIL RIG stands for:
A) Oxidation is loss, reduction is gain (of electrons)
B) Oxidation is loss, reduction is gain
C) Oxygen is lost, reduction is gained
D) Oxidation involves loss of protons, reduction involves gain of protons
Answer B: Oxidation is loss, reduction is gain
Rationale: OIL RIG is a mnemonic: Oxidation Is Loss (of electrons), Reduction Is Gain (of electrons).




11. A reduction refers to:
A) Reduced charge by adding a negative electron
B) Loss of an electron
C) Loss of a proton
D) Gain of a proton
Answer A: Reduced charge by adding a negative electron

, Rationale: Reduction is the gain of electrons, which reduces the charge.
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12. The transfer of electrons from molecules that have stored energy, such as glucose, to other
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A) Cellular respiration
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B) Photosynthesis
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C) Fermentation
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D) Hydrolysis
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Answer A: Cellular respiration
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Rationale: Cellular respiration involves the transfer of electrons from energy-rich molecules to generate ATP.
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13. Name 4 metabolic process chemical reactions.
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A) Redox, dehydration condensation, dehydration, hydrolysis
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B) Oxidation, reduction, hydrolysis, dehydration
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C) Anabolism, catabolism, respiration, photosynthesis
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D) Glycolysis, Krebs cycle, ETC, fermentation
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Answer A: Redox, dehydration condensation, dehydration, hydrolysis
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Rationale: These four reaction types are fundamental to metabolic processes.
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14. True or False: In a dehydration condensation reaction, water is the only type of molecule that can be
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A) True
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B) False
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Answer B: False j j




Rationale: Other small molecules (e.g., HCl) can also be lost, not just water.
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15. Name three molecules other than water that can be lost in a dehydration condensation reaction.
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A) Hydrogen chloride, carbon dioxide, ammonia
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B) Oxygen, nitrogen, carbon dioxide
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C) Hydrogen, oxygen, nitrogen
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D) Methane, ethane, propane
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Answer A: Hydrogen chloride, carbon dioxide, ammonia
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