What class of enzyme most likely catalyzes the reaction shown in the figure? (choose the one best answer) Oxidoreductase Hydrolase Ligase Lyase Transferase Isomerase
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- Based on your knowledge of the structure of NAD+ and an assumption that coenzyme dissociation is the rate limiting step of the alcohol dehydrogenase mechanism, hypothesize why a N249W mutation at the coenzyme binding site would increase the rate of catalysis.The enzyme that catalyzes reaction below can be classified as: CoO COO NAD+ NADH + H* Но- | malate -C- H-Ć- dehydrogenase Охaloacetate Malate isomerase lyase hydrolase oxidoreductase ligase transferaseasap
- What is the catalytic efficiency of Catalase ? Table. The values of KM and kcat for some Enzymes and Substrates Enzyme Carbonic anhydrase Substrate CO2 HCO3 KM (M) 1.2 x 10-2 2.6 x 10-2 Kcat (s-1) 1.0 x 106 4.0 x 105 Catalase H2O2 2.5 x 10-2 1.0 x 107 Urease Urea 2.5 x 10-2 4.0 x 105 O A. 4 x 108 M-s-1 O B. 4 x 108 M-1.s-1 OC25x 10-9 M-s1 D. 2.5 x 102 M-1.s-1 OE 1.0 x 107 s1Which class of enzymes catalyzes the following reactions? CH2- CH2- CH2 H2- C- CH2 AST CH2-C CH2 CH-NH + C=O + C=0 + CH-NH ČO0 Čo0 ČO0 ČO0" Aspartate Oxoglutarate Oxaloacetate Glutamate Select one: a. Oxidoreductase O b. Isomerase O c. Ligase d. Transferasea particular enzyme catalyzes a single reactant S to a single product P, following michaelis-menten kinetics rp=(VmaxCs) / (Km + Cs) 1. A reaction with this enzyme is carried out at very low substrate concentrations. Draw and label a curve on the plot that describes the reaction kinetics under those conditions.
- a What would be the appropriate name for an enzyme that catalyzes each of the following reactions: b H3C iOH OH NH₂ alanine ligase alanine oxidoreductase alanine isomerase alanine transferase OH H3C CH3 H3C NO₂ propanone transferase propan-2-ol hydrolase propan-2-ol oxidoreductase propan-2-ol isomerase OH H3C CH3The protein catalase catalyzes the reaction 2H,O,(aq) — 2H,O(l) + O,(g) and has a Michaelis-Menten constant of KM = 25 mM and a turnover number of 4.0 × 107 s¯¹. The total enzyme concentration is 0.010 µM and the initial substrate concentration is 4.83 µM. Catalase has a single active site. Calculate the value of Rmax (often written as Vmax) for this enzyme. Rmax Calculate the initial rate, R (often written as V), of this reaction. R = ×10 mM.s-1 mM-s-1Compare and contrast Pyruvate Dehydrogenase with a-ketoglutarate dehydrogenaseOutline the mechanisms of both enzymes. Discuss the functions of the coenzymes. List the similarities and the differences between the 2 enzymes. Both are very large membrane bound complexes. What are the advantages of this strategy?How detailed is the enzyme structure known below(It's Pyruvate Dehydrogenase )? What insight(s) does this structural detail give you about the enzyme mechanism.
- Page of 6 ZOOM + name: 3. In the last reaction of the citric acid cycle, malate is dehydrogenated to regenerate the oxaloacetate necessary for the entry of acetyl-CoA into the cycle: L-Malate + NAD+ → oxaloacetate + NADH + H* AG'° = 30.0 kJ/mol (a) Calculate the equilibrium constant for this reaction at 25 °C. (b) Because AG°' assumes a standard pH of 7, the equilibrium constant calculated in (a) corresponds to [oxaloacetate][NADH] Keq [L-malate][NAD*] The measured concentration of L-malate in rat liver mitochondria is about 0.20 mM when [NAD*]/[NADH] is 10. Calculate the concentration of oxaloacetate at pH 7 in these mitochondria. (c) To appreciate the magnitude of the mitochondrial oxaloacetate concentration, calculate the number of oxaloacetate molecules in a single rat liver mitochondrion. Assume the mitochondrion is a sphere of diameter 2.0 microns.The following nutrient molecule is digested and transported to a cell where it undergoes further catabolism: но c-(CH;)14-CH3 di In the table below, list the important products of the complete B oxidation of this molecule. • In the first column of the table, write the chemical formula, name, or standard biochemical symbol for a product molecule. In the second column, write the total number of these molecules produced. • Only list the Important products, including (1) molecules with any of the carbon atoms that were in the original molecule, (2) energy storage molecules (like ATP), and (3) newly oxidized or reduced coenzymes. List each product molecule on a separate row. You can add more rows if you need them. • Be sure you write the number of product molecules formed by the complete B oxidation of the molecule above. • Do not include the products of any catabolic activity that happens before or after B oxidation, including any necessary activation. If the molecule contains small parts…The glyceraldehyde-3-phosphate dehydrogenase reaction of glycolysis, (glyceraldehyde-3- phosphate → 1,3 bisphosphoglycerate) (Choose all that apply) O conserves energy by transfer of a proton H* to NAD+ forming NADH O has a high energy thioester intermediate on the enzyme/substrate complex O mechanistically uses covalent catalysis O conserves energy in the formation of a oxygen phosphoric ester O conserves energy in the formation of a carboxylic-phosphoric mixed anhydride O mechanistically requires the coenzyme thiamine pyrophosphate (TPP) to act as an electron sink