___________ respiration is directly involved in the production of energy, necessary for all living activities?
Correct answer: B. Cellular
- A. Organismic
- B. Cellular
- C. Both of these
- D. None of these
Explanation
Cellular respiration directly produces ATP by oxidizing glucose and other respiratory substrates, and ATP supplies usable energy for cellular activities. Students may choose organismic respiration because breathing supplies oxygen, but breathing itself does not directly generate most cellular ATP.
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About Cellular Respiration
Cellular respiration releases energy from glucose through glycolysis, the link reaction, the Krebs cycle and the electron transport chain, producing ATP. The pathway differs in oxygen availability: aerobic respiration uses oxygen and yields more ATP, while anaerobic respiration produces much less ATP and forms lactic acid in muscles or ethanol and carbon dioxide in yeast.
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