Which of these substrates is not a source of succinyly-CoA for TCA cycle anaplerosis? Propionyl-CoA Phytanic acid Valine Leucine

Which of the following most accurately describes the impact acetyl-CoA has in the cytosol of the liver cell? Acetyl CoA serves as an allosteric inhibitor of PFK Acetyl CoA serves as an allosteric inhibitor of pyruvate kinase Acetyl CoA serves as an allosteric activator of PFK Acetyl CoA serves as an allosteric activator of pyruvate kinase Acetyl CoA serves as an allosteric activator of fructose-2,6-bisphosphatase Acetyl CoA serves as an allosteric activator of PFK-2

hyperammonemia in patients is compounded by the reality of the normal regulatory controls in the urea cycle. Explain how increased GDH oxidative deamination activity will inhibit the urea cycle.

Acetyl-CoA is generated by E1 and E2 ... purpose of E3? (PDHC)

Which of the following statements regarding the active site of cytochrome P450s is correct? Cytochrome P450-catalyzed monooxygenation proceeds with low stereoselectivity Cytochrome P450-catalyzed monooxygenation requires two electrons supplied by the redox process involving NADPH and NADP+. The 5th distal position (below the plane of the porphyrin ring) in cytochrome P450 is always occupied by His Cytochrome P450 is responsible for the metabolism of the minority of prescription drugs Cytochrome P450 contains manganese

Which of the following are required for serine biosynthesis (select all that apply)? O NADP+ O 3-phophogylcerate O PLP pyruvate O glutamate O PEP

In a P450 cycle, as shown in figure, ferrodoxin and ferrodoxin reductase are needed to form Fe (III) to Fe (III)-OOH. But why the peroxide shunt are also able to complete this process independent of Fd system (ferrodoxin and ferrodoxin reductase...)?