What is the role of citric acid in the tricarboxylic acid (TCA) cycle?
A. Converts glucose to amino acids for storage
B. Converts ammonia to urea for excretion
C. Converts amino acids to glucose for energy
D. Converts acetyl-CoA to energy in the form of ATP
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What is the significance of branched-chain amino acids (BCAAs) like leucine and isoleucine?
A. Important for neurotransmitter production
B. Associated with cardiovascular disease risk
C. Crucial for antioxidant defense
D. Play roles in muscle protein synthesis and energy metabolism
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