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Biology CH 7
Chapter 7 Test Questions
| Question | Answer |
|---|---|
| Which metabolic processes do not require oxygen? | Glycolysis, Alcoholic Fermentation, Lactic Acid Fermentation |
| Which metabolic process absolutely requires oxygen? | Electron Transport Chain (ETC) |
| Is glycolysis aerobic or anaerobic? | Anaerobic (does not require oxygen) |
| Is alcoholic fermentation aerobic or anaerobic? | Anaerobic |
| Is lactic acid fermentation aerobic or anaerobic? | Anaerobic |
| Is the Krebs cycle dependent on oxygen being available? | Yes the Krebs cycle IS dependent on oxygen being available |
| Why is the Krebs cycle dependent on oxygen being available? | Even though oxygen is not used directly in the Krebs cycle, the cycle depends on oxygen because the ETC needs oxygen to regenerate NAD⁺ and FAD. Without oxygen, the Krebs cycle eventually stops. |
| Why can't the ETC function without oxygen? | Oxygen is the final electron acceptor. |
| At the end of the ETC: | - Oxygen accepts electrons and hydrogen ions. - Water (H₂O) is formed. - If oxygen is absent, electrons back up in the chain. - NADH and FADH₂ cannot unload their electrons. - ATP production stops. |
| Does Krebs Cycle require oxygen? | Indirectly Yes |
| Does Electron Transport Chain require oxygen? | Yes- Only the ETC uses oxygen directly, but the Krebs cycle depends on the ETC |
| Where in the cell does glycolysis occur? | Cytoplasm (cytosol) |
| Where does alcoholic fermentation occur? | Cytoplasm (cytosol) -- occurs after glycolysis and does not enter the mitochondria. |
| Where does lactic acid fermentation occur? | Cytoplasm (cytosol) -- occurs in muscle cells when oxygen is limited. |
| In what part of the mitochondrion does the Krebs cycle occur? | Mitochondrial matrix --- The matrix is the fluid-filled space inside the inner membrane. |
| In what part of the mitochondrion does the Electron Transport Chain occur? | Inner mitochondrial membrane (cristae) -- The ETC proteins and ATP synthase are embedded in the inner membrane. |
| Which processes occur outside the mitochondria? | Glycolysis, Alcoholic Fermentation, Lactic Acid Fermentation --- All three occur in the cytoplasm |
| Which processes occur inside the mitochondria? | Pyruvate Oxidation (Link Reaction), Krebs Cycle (Citric Acid Cycle), Electron Transport Chain (ETC) |
| Outside (Cytoplasm): | Glycolysis + Both Fermentations |
| Inside (Mitochondria): | Pyruvate Oxidation + Krebs + ETC |
| How many net ATP are produced during glycolysis? | 2 ATP (net) |
| How many ATP are produced during alcoholic fermentation itself? | 0 ATP- - The ATP comes from glycolysis. Fermentation only regenerates NAD⁺. |
| How many ATP are produced during lactic acid fermentation itself? | 0 ATP --- Again, the ATP comes from glycolysis, not fermentation. |
| How many ATP are produced by the Krebs cycle? | 2 ATP per glucose |
| Which stage produces the most ATP? | Electron Transport Chain (ETC) |
| Approximately how many ATP are produced by the ETC? | About 32 ATP |
| What are the major products of glycolysis? | 2 Pyruvate, 2 NADH, 2 ATP (net) |
| Does glycolysis produce NADH or NAD+? | NADH |
| Does glycolysis produce CO₂? | glycolysis does NOT produce CO₂ |
| Does glycolysis produce ATP? | Yes (2 net ATP) |
| What are the products of alcoholic fermentation? | Ethanol, CO₂, NAD⁺ |
| Does alcoholic fermentation produce ethanol? | alcoholic fermentation DOES produce ethanol |
| Does alcoholic fermentation produce CO₂? | alcoholic fermentation DOES produce CO₂ |
| Does alcoholic fermentation regenerate NAD+? | alcoholic fermentation DOES regenerate NAD+ |
| Does alcoholic fermentation produce NADH? | alcoholic fermentation DOES NOT produce NADH |
| What are the products of lactic acid fermentation? | Lactic Acid (Lactate), NAD⁺ |
| Does lactic acid fermentation produce lactic acid? | lactic acid fermentation DOES produce lactic acid |
| Does lactic acid fermentation release CO₂? | lactic acid fermentation DOES NOT release CO₂ |
| Does lactic acid fermentation regenerate NAD+? | lactic acid fermentation DOES regenerate NAD+ |
| What are the major products of the Krebs cycle? | 2 ATP, 6 NADH, 2 FADH₂, 4 CO₂ |
| Does the Krebs cycle produce NADH? | the Krebs cycle DOES produce NADH |
| Does the Krebs cycle produce FADH₂? | the Krebs cycle DOES produce FADH₂ |
| Does the Krebs cycle produce CO₂? | the Krebs cycle DOES produce CO₂ |
| Does the Krebs cycle produce water? | the Krebs cycle DOES produce water |
| What are the major products of the ETC? | ATP, Water (H₂O), NAD⁺, FAD |
| Does the ETC produce water? | the ETC DOES produce water |
| Does the ETC consume oxygen? | the ETC DOES consume oxygen ---Oxygen is the final electron acceptor. |
| Does the ETC produce NADH or use NADH? | the ETC uses NADH --- NADH is converted back into NAD⁺ |
| Does the ETC produce ATP? | es, about 32 ATP |
| Glycolysis occurs in the __________. | cytoplasm (cytosol) |
| The Krebs cycle occurs in the mitochondrial __________. | matrix |
| The ETC occurs on the mitochondrial __________ membrane. | inner |
| The final electron acceptor is __________. | oxygen (O₂) |
| Alcoholic fermentation produces __________ and __________. | ethanol and carbon dioxide (CO₂) |
| Lactic acid fermentation produces __________. | lactic acid (lactate) |
| The ETC produces approximately __________ ATP. | 32 |
| Glycolysis produces a net gain of __________ ATP. | 2 |
| The Krebs cycle produces __________ ATP per glucose | 2 |
| The ETC produces __________ as a byproduct. | water (H₂O) |
| Fermentation regenerates __________ so glycolysis can continue | NAD⁺ |
| 2 ATP (glycolysis), 2 ATP (Krebs), 32 ATP (ETC), Oxygen = | final electron acceptor, NAD⁺ is regenerated by fermentation |
Created by:
jsminnie118
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