16. When a nucleophile attacks the ß phosphorous atom of ATP, what kind of transfer occurs? A. B. C. D. E. pyrophosphoryl transfer phosphoryl transfer adenosine transfer adenylyl transfer triphosphate transfer
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- Figure 27.3 illustrates the response of R (ATP-regenerating) and U (ATP-utilizing) enzymes to energy charge. a. Would hexokinase be an R enzyme or a U enzyme? Would glutamine: PRPP amidotransferase, the second enzyme in purine biosynthesis, be an R enzyme or a U enzyme? b. If energy charge = 0.5: Is the activity of hexokinase high or low? Is ribose-5-P pyrophosphokinase activity high or low? c. If energy charge = 0.95: Is the activity of hexokinase high or low? Is ribose-5-P pyrophosphokinase activity high or low?The compound triclosan inhibits bacterial enoyl-ACP reductase. Explain why triclosan is useful as a microbicide.a. What is the function of bactoprenol in peptidoglycan synthesis? b. During peptidoglycan synthesis, removal of a phosphate group from bactoprenol pyrophosphate is inhibited. What is the immediate outcome? What does this mean for cell wall synthesis? Which antibiotic works via this mechanism? c. Bacterium Y is photosynthetic. You want to decrease the ability of Bacterium Y to produce glucose through photosynthesis. Explain how you could manipulate the light reactions of photosynthesis to decrease glucose production during the dark reactions in Bacterium Y. Include the name of the pathway that makes glucose during the dark reactions, which/how molecules from the light reactions are used in this pathway, and what specific steps of this pathway would be affected by your manipulations.
- Draw the structures of the activated carbon groups bound to thiamine pyrophosphate in three enzymes that contain this coenzyme. Hint: Keto–enol tautomerism may enter into the picture.The first step of the lysozyme reaction (catalytic mechanism) is shown in the figure below. Which statement regarding lysozyme is true? Glu 35 HO O(NAM) R (NAG) Asp 52 a. The local environment of Asp 52 significantly changes its pka. b. Glu 35 has an unusually low pKa due to its hydrophobic environment. c. Glu 35 provides acid/base assistance during catalysis. d. Glu 35 acts as a nucleophile during catalysis.Consider the metabolic pathway show below that converts substrate A to B with the enzyme A-ase, B to C with B-ase(I), and so forth. Acety/A-ase A-ase Acetate Deacetylase D Protease B-ase C-ase A-ase ABC- What is the mechanism of regulation of B-ase? Positive allostery Reversible Covalent modification Isoenzymes Proteolytic Activation Feedback Inhibition
- You have genetically engineered a yeast protein to convert Glyceraldehyde-3-phosphate directly to 3-phosphoglycerate. Give a detailed explanation of how this protein would affect the growth of yeast cells and energy production as well as under what conditions (aerobic/anaerobic) these would be affected.Consider the metabolic pathway show below that converts substrate A to B with the enzyme A-ase, B to C with B-ase(I), and so forth. Acety/A-ase Acetate - A-ase Deacetylase A-ase Protease & C-ase B-ase ABCD What is the mechanism of regulation of B-ase? Positive allostery Reversible Covalent modification Isoenzymes Proteolytic Activation Feedback Inhibition 13. b. If chymotrypsin is treated with disopropylfluorophosphate, catalysis cannot occur even in the presence of excess substrate concentration. Is this Inhibltion reversible or Irreversible?. Dilsopropylfluorophosphate Hyd
- 1.Why do you think glutathione occurs in a concentration as high as glucose? 2.Explain why glutathione must be transported from cytosol to mitochondria. 3.Explain why glutathione can confer therapeutic benefit when taken orally.Match the following catalytic strategies with their example. Place a Letter on the picture. There are only two examples given. CH2OH CH2OH H. CH,OH CH2OH он он OH Kon + H2O OH HO OH OH OH HO но OH OH OH OH A. Oxidoreducatase OH OH B. Transferase C. Hydrolase D. Lyase NH3 E. Isomerase F. Ligase R-CH-COO + 00C-CH2-CH2-C-COO Amino acid a-Ketoglutarate NH3 + 00c-CH2-CH2–CH-C0 R-C-COO a-Keto acid GlutamateWhich residue of phenylalanine hydroxylase is phosphorylated? A. Met18 B. Ser16 C. Ser12 D. Tyr24