Enzymes — Flashcards

Flashcard 11: The three enzyme components of Pyruvate dehydrogenase complex are: Pyruvate dehydrogenase, Dihydrolipoyl _____ and Dihydrolipoyl dehydrogenase

Answer: transacetylase

Flashcard 12: Propionyl-CoA carboxylase requires _____, biotin, and CO2

Answer: ATP

Flashcard 13: If the amount of enzymes doubles, the Vmax _____, while Km remains constant

Answer: doubles

Flashcard 14: What enzymes (2) neutralize hydrogen peroxide (H2O2)? _____ and Glutathione peroxidase

Answer: Catalase

Extra: • Catalase: 2H2O2 → 2H2O + O2 • Glutathione peroxidase: H2O2 + 2GSH → 2H2O + GSSG (where GSH is reduced glutathione)

Flashcard 15: H2CO3 is converted into _____ and CO2 by carbonic anhydrase

Answer: H2O

Flashcard 16: Once I- has been pumped into the cell for thyroid hormone synthesis, it is _____ to I2 by the enzyme thyroid peroxidase in the follicular cell membrane

Answer: oxidized

Flashcard 17: Pancreatic and salivary _____ hydrolyze alpha-1,4-glycosidic bonds in starch

Answer: alpha-amylases

Flashcard 18: _____ is converted into fructose and glucose by the enzyme sucrase

Answer: Sucrose

Flashcard 19: _____ is a serine protease cleaves at the carboxy-terminal of basic amino acids like arginine and lysine

Answer: Trypsin

Flashcard 20: _____ catalyze the conversion of cyclic endoperoxides i.e., PGG2 and PGH2 into PGE2 and PGD2

Answer: Isomerases