Electrons extracted from acyl coa in the first step

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17. Electrons extracted from acyl-CoA in the first step of fatty acid oxidation in peroxisomes are passed to A) Q B) NAD + C) O 2 D) NADP + 18. Indicate whether Quinones occur in chloroplasts, mitochondria, or both: 19. Nitrogenase carries out the reaction that reduces nitrogen to ______. 20. Which enzyme has a higher affinity for glucose at physiological concentrations? A) hexokinase B) glucokinase Section II: 62 points, total (2 points each) 21. Which enzyme associated with nucleotide metabolism utilizes a cysteine free radical in its mechanism? 22. What do acetyl-CoA carboxylase, pyruvate carboxylase, and propionyl-CoA carboxylase have in common? A) The involve reductive carboxylations. D) They involve CTP-dependent decarboxylations. B) They involve oxidative decarboxylations. E) None of the above are true. C) They involve ATP-dependent carboxylations. Scrambled version A Page 2
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23. G proteins: 24. In fatty acid catabolism, chain shortening occurs at the _____ end of the fatty acyl chain. 25. Which of the following hormones acts as an appetite suppressor? 26. Which of the following is NOT an aspect of Photosystem II? A) Electrons from PSII are passed to plastoquinone. B) PSII oxidizes 2 H 2 O to produce 1 O 2 involving 2 photooxidations. C) The reaction center chlorophyll absorbs a wavelength of 680 nm. D) A manganese catalyst extracts electrons from water. E) All of the above are true. 27. The final carrier of electrons from PSI is ____, which can then dispose of electrons to produce either ATP or NADPH. 28. Which of the following represents the correct order of the transaminase mechanism? i. amine group transferred from PLP to keto acid substrate ii. amine group transferred to PLP and keto acid product released iii. keto acid substrate binds iv. amine donor binds v. amino acid product released 29. Which of the following compounds is a storage form of fixed CO 2 produced by the C 4 pathway?
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