Reactions in which simple substances are combined to form complex substances are called_____________?
Correct answer: C. Anabolic reactions
- A. Metabolic reactions
- B. Catabolic reactions
- C. Anabolic reactions
- D. None of these
Explanation
Anabolic reactions build complex molecules from simpler substances and usually require an input of energy, such as the formation of proteins from amino acids. Catabolic reactions do the opposite by breaking complex molecules down and often releasing energy. Students most likely choose metabolic reactions, but metabolism includes both anabolic and catabolic reactions.
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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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