Ch. 22 Lehninger biochem test bank | 44 Questions and Answers(A+ Solution guide)

1. Which of the following statements about the fixation of atmospheric nitrogen (N2) into NH3 by living cells is false? A) It involves the transfer of eight electrons per mol of N2. B) It occurs in certain microorganisms, but not in humans. C) It requires a source of electrons, normally ferredoxin. D) It requires one ATP per mol of N2 fixed. E) It requires two key protein components, each containing iron. - D 2. Which of the following is not true about the anammox reaction? A) Anammox converts ammonia to nitrogen. B) Anammox is performed by symbiotic bacteria of leguminous plants. C) Anammox generates the highly reactive molecule hydrazine that is a component of rocket fuel. D) Anammox occursw anaerobically. E) The ultimate electron acceptor in anammox is nitrite. - B 3. Which of the following enzymes is not involved in the assimilation of inorganic nitrogen into an organic molecule? A) Dinitrogenase reductase B) Nitrate reductase C) Nitrite reductase D) Nitrile reductase E) Dinitrogenase - D4. Which of the following enzymes is not involved in the assimilation of inorganic nitrogen into an organic molecule? A) Arginase B) Glutamate dehydrogenase C) Glutamate synthase D) Glutamine synthetase E) Dinitrogenase - A