55. Which allosteric effector activates isocitrate dehydrogenase and thereby accelerates the TCA cycle? (A) ATP (B) NADH (C) ADP (D) GTP

63. Which statement correctly distinguishes coenzymes from prosthetic groups? (A) Coenzymes bind transiently; prosthetic groups are tightly or covalently bound (B) Prosthetic groups are inorganic; coenzymes are organic (C) Coenzymes are permanently bound; prosthetic groups are transient (D) Prosthetic groups do not participate in catalysis