biochemistry usmle step 1 questions and answers
. Determine the number of ATP molecules, which are formed in Krebs cycle at the conversion of isocitric acid to fumaric acid (I) and to succinyl CoA (II) respectively: A) I -7,0; II - 5,5 B) I - 5; II - 3,5 C) I - 6,5; II - 4,5 D) I - 7,5; II - 5 E) I - 7; II - 3 2. In which stages of citric acid cycle is CO2 formed? 1) Izocitrate - α-Ketoglutarate 2) Succinate - Fumarate 3) α-Ketoglutarate -Succinil-CoA 4) Fumarate – Malate 5) Malate –Oxaloacetate A) 1,3 B) 2,4 C) 1,4 D) 3,4 E) 4,5 3. Choose coenzymes involved in the process of oxydative decarboxylation of pyruvate. A) PALF, THFA, THP, NAD + , FAD B) THFA, TPP, FAD, LA, NAD + C) TPF, FAD, HS-CoA, NAD + , LA D) NADP, FAD, LA, TPF, NAD + E) TPF, NAD + , HS-CoA, PALF, FAD
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biochemistry usmle step 1 questions and answers
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