An investigator is studying severely ill patients who experience hypoglycemia and ketonuria during times of fasting. The investigator determines that during these episodes, amino acids liberated from muscle proteins are metabolized to serve as substrates for gluconeogenesis. Nitrogen from this process is transported to the liver primarily in the form of which of the following molecules?
AGlutamate
Bα-ketoglutarate
CAlanine
DArginine
EPyruvate
An investigator is studying a hereditary defect in the mitochondrial enzyme succinyl-CoA synthetase. In addition to succinate, the reaction catalyzed by this enzyme produces a molecule that is utilized as an energy source for protein translation. This molecule is also required for which of the following conversion reactions?
AOxaloacetate to phosphoenolpyruvate
BPyruvate to acetyl-CoA
CAcetaldehyde to acetate
DGlucose-6-phosphate to 6-phosphogluconolactone
EFructose-6-phosphate to fructose-1,6-bisphosphate
After being warned by the locals not to consume the freshwater, a group of American backpackers set off on a week-long hike into a region of the Ecuadorean Amazon forest known for large gold mines. The group of hikers stopped near a small stream and used the water they filtered from the stream to make dinner. Within the next half hour, the hikers began to experience headaches, vertigo, visual disturbances, confusion, tachycardia, and altered levels of consciousness. Which of the following enzymes was most likely inhibited in this group of hikers?
ANADH dehydrogenase
BATP synthase
CCytochrome c oxidase
DCytochrome bc1 complex
ESuccinate dehydrogenase
+ 7 more in the PDF
Browse all chapters