16. Which of the following best explains the enzyme(s) involved in ribonucleotide reduction? (A) there is 1 enzyme for each of the 4 different nucleotides (B) 1 enzyme for pyrimidine nucleotides and 1 for purine nucleotides (C) 1 enzyme for pyrimidine nucleotides, 1 for ADP and I for GDP (D) 1 enzyme for purine nucleotides, 1 for CDP and 1 for UDР (E) 1 enzyme for all 4 nucleotides

1. Which of the following statements regarding the general concepts of metabolism is true? (A) once glucose is converted to pyruvate, there is no way to convert pyruvate back to glucose (B) when triacylglycerols are used as fuel, only the fatty acids can be metabolized, the glycerol is a waste product (C) all 20 common amino acids can be made from metabolites derived from the citric acid (or TCA) cycle (D) the citric acid (or TCA) cycle is generally considered an anabolic pathway while gluconeogenesis is generally considered a catabolic pathway (E) none of the above

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