WGU C190 Unit 4 Metabolism Practice Test 2026 |
Questions & Answers PDF
1. Describe the role of carbon dioxide and water in photosynthesis.
Carbon dioxide is released as a waste product, while water is used for
energy.
Carbon dioxide and water are converted into glucose and oxygen
during photosynthesis.
Water is the primary energy source, while carbon dioxide is a
byproduct.
Carbon dioxide and water are used to produce ATP directly.
2. Which of the following is needed as a reactant for cellular respiration?
oxygen
carbon dioxide
water
chlorophyll
3. The reactants of photosynthesis are:
sugar.
O2 and CO2
CO2 and water.
sugar and water.
O2 and sugar.
4. Describe the role of NAD+ in cellular metabolism.
, NAD+ is synthesized from glucose during glycolysis.
NAD+ is only involved in photosynthesis.
NAD+ is a waste product of cellular respiration.
NAD+ acts as an electron carrier that is reduced to NADH during
metabolic reactions.
5. Describe the significance of oxygen in the process of cellular respiration for
aerobic organisms.
Oxygen is used to convert glucose into pyruvate during glycolysis.
Oxygen is primarily involved in the Calvin cycle of photosynthesis.
Oxygen is not necessary for energy extraction in aerobic organisms.
Oxygen is essential for aerobic organisms as it acts as the final
electron acceptor in the electron transport chain, allowing for
efficient ATP production.
6. In bacteria, fermentation occurs in the
mitochondria
cell wall
cell membrane
cytoplasm
7. What is the ultimate source of energy for nearly all living organisms on Earth?
The Sun
Nuclear energy
Geothermal energy
Chemical energy
, 8. Describe the role of mitochondria in the process of cellular respiration.
Mitochondria produce glucose during photosynthesis.
Mitochondria convert nutrients into ATP through cellular respiration.
Mitochondria store genetic information for the cell.
Mitochondria synthesize proteins for cellular functions.
9. Which of the following statements is true?
2 NADPH molecules are produced during pyruvate processing
A and B are true
ATP is formed in glycolysis through oxidative phosphorylation
A and C are true
NAD+ is reduced to NADH during glycolysis, pyruvate processing,
and the citric acid cycle
10. What term is used to describe organisms that require oxygen for energy
extraction?
aerobic
autotrophic
facultative
anaerobic
11. Which of the following does not use an electron transport chain?
fermentation
anaerobic cell respiration
aerobic cell respiration
Questions & Answers PDF
1. Describe the role of carbon dioxide and water in photosynthesis.
Carbon dioxide is released as a waste product, while water is used for
energy.
Carbon dioxide and water are converted into glucose and oxygen
during photosynthesis.
Water is the primary energy source, while carbon dioxide is a
byproduct.
Carbon dioxide and water are used to produce ATP directly.
2. Which of the following is needed as a reactant for cellular respiration?
oxygen
carbon dioxide
water
chlorophyll
3. The reactants of photosynthesis are:
sugar.
O2 and CO2
CO2 and water.
sugar and water.
O2 and sugar.
4. Describe the role of NAD+ in cellular metabolism.
, NAD+ is synthesized from glucose during glycolysis.
NAD+ is only involved in photosynthesis.
NAD+ is a waste product of cellular respiration.
NAD+ acts as an electron carrier that is reduced to NADH during
metabolic reactions.
5. Describe the significance of oxygen in the process of cellular respiration for
aerobic organisms.
Oxygen is used to convert glucose into pyruvate during glycolysis.
Oxygen is primarily involved in the Calvin cycle of photosynthesis.
Oxygen is not necessary for energy extraction in aerobic organisms.
Oxygen is essential for aerobic organisms as it acts as the final
electron acceptor in the electron transport chain, allowing for
efficient ATP production.
6. In bacteria, fermentation occurs in the
mitochondria
cell wall
cell membrane
cytoplasm
7. What is the ultimate source of energy for nearly all living organisms on Earth?
The Sun
Nuclear energy
Geothermal energy
Chemical energy
, 8. Describe the role of mitochondria in the process of cellular respiration.
Mitochondria produce glucose during photosynthesis.
Mitochondria convert nutrients into ATP through cellular respiration.
Mitochondria store genetic information for the cell.
Mitochondria synthesize proteins for cellular functions.
9. Which of the following statements is true?
2 NADPH molecules are produced during pyruvate processing
A and B are true
ATP is formed in glycolysis through oxidative phosphorylation
A and C are true
NAD+ is reduced to NADH during glycolysis, pyruvate processing,
and the citric acid cycle
10. What term is used to describe organisms that require oxygen for energy
extraction?
aerobic
autotrophic
facultative
anaerobic
11. Which of the following does not use an electron transport chain?
fermentation
anaerobic cell respiration
aerobic cell respiration
