10 questions · Form 4 Biology Bab 6: Cellular Respiration
10 questions · plays in fullscreen
Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.
1. Where in the eukaryotic cell does the glycolysis pathway take place?
Answer: B
Glycolysis is the initial step of glucose breakdown that occurs exclusively in the cytoplasm and does not require oxygen.
2. Which cellular organelle is essential for carrying out the Krebs cycle and electron transport chain in aerobic respiration?
Answer: C
Mitochondria are the powerhouse organelles where aerobic stages (Krebs cycle and Electron Transport Chain) take place.
3. What structural feature of inner mitochondrial membranes maximizes ATP synthesis during aerobic respiration?
Answer: B
The inner mitochondrial membrane has numerous folds (cristae) that increase the surface area for electron transport enzymes and ATP synthase.
4. How many ATP molecules are produced per glucose molecule during fermentation?
Answer: A
Because glucose is only partially broken down in fermentation, only 2 ATP molecules are produced during the glycolysis step.
5. Which set of end products is produced during alcohol fermentation in yeast cells?
Answer: B
Yeast decomposes glucose incompletely into ethanol, carbon dioxide, and 2 ATP molecules during alcohol fermentation.
6. What is the term given to the condition where oxygen intake is insufficient to meet energy demands during intense exercise, forcing muscles to ferment glucose?
Answer: B
Oxygen debt is the extra amount of oxygen required after strenuous exercise to oxidize accumulated lactic acid in the body.
7. During bread making, what causes dough to rise and expand before baking?
Answer: B
Carbon dioxide gas produced by yeast during alcohol fermentation gets trapped inside the dough, causing it to swell and rise.
8. What is the primary organic substrate utilized by living cells to initiate cellular respiration?
Answer: B
Glucose is the main respiratory substrate derived from carbohydrate breakdown used by cells to yield ATP.
9. What is the approximate total net yield of ATP molecules produced from one fully oxidized glucose molecule in aerobic respiration?
Answer: C
Aerobic respiration completely oxidizes glucose to yield a high net output of 36 to 38 ATP molecules per glucose.
10. Why do human skeletal muscle cells experience fatigue and muscle cramps during strenuous physical activity?
Answer: B
Under oxygen deficit, muscle cells perform lactic acid fermentation; accumulated lactic acid lowers pH and causes muscle cramps and fatigue.