Metabolism — Flashcards

Flashcard 1181: After 1 - 3 days of starvation, the muscle and liver shift fuel use from glucose to _____

Answer: free fatty acids

Flashcard 1182: Folate deficiency is characterized by _____ serum homocysteine

Answer: increased

Flashcard 1183: If O2 accepts two electrons, it forms _____

Answer: hydrogen peroxide (H2O2)

Flashcard 1184: _____ facilitate hydrolysis of GTP, decreasing the rate of G protein activation

Answer: GTPase activating proteins (GAPs)

Flashcard 1185: In the _____, nucleic acids are broken down into nucleotide monomers

Answer: small intestine

Flashcard 1186: The Michaelis-Menten constant, Km is _____ proportional to the affinity of the enzyme for its substrate

Answer: inversely

Flashcard 1187: Does hemolysis result in unconjugated or conjugated hyperbilirubinemia? _____

Answer: Unconjugated

Flashcard 1188: What is the major source of energy during the first 2 - 7 seconds of exercise? _____

Answer: Creatine phosphate

Flashcard 1189: Which three amino acids are the precursors to glutathione?

Answer: Glutamate, Cysteine, and Glycine

Extra: Glutathione (GSH) is a tripeptide: γ-glutamyl-cysteinyl-glycine. Cysteine is typically the rate-limiting amino acid for its synthesis.

Flashcard 1190: What enzyme is a blue-green heme pigment that gives sputum its color?_____

Answer: Myeloperoxidase