Carotenoids perform protective function in_____________?
Correct answer: C. Both of these
- A. Animals
- B. Plants
- C. Both of these
- D. None of these
Explanation
Carotenoids protect photosynthetic tissues by dissipating excess light energy and preventing photooxidative damage to chlorophyll; in animals, dietary carotenoids can also act as antioxidant protective compounds. Students may choose plants only because the photosynthetic protective role is emphasized in biology texts, but the broader protective function occurs in both plants and animals.
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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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