What are the products of the following transamination reaction? a-ketoglutarate + alanine O glutamate; pyruvate none of these aspartate; oxaloacetate aspartate; pyruvate O glutamate; oxaloacetate
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- The Reactions and Meehanisms of the Leloir Pathway Write the reactions that permit galactose to be utilized in glycolysis. Write a suitable mechanism, tor one of these reactions.The inilial reactions in the biosynthesis of the amino acid aspartate at 298 K are: Carbamoyphoephate Cartamoyi + phosphate ADP + phoaphate - ATP AO=-12,300 calmol AG-T800 calimol Which of the following statements is gorrect? A) The energy which is released fron the conversion of 1 mole of carbamoyphosphate to carbamoyl+ phosphate (P) in reaction I is sufficient to drive the synthesis of 1 mole of ATP in reaction II. B) AG for the reaction Carbamoyphosphate + Carbamoyl + phosphate is +123 kcalimol. c) AHP for reaction I cannot be detemined trom the information given. D) Al of the above. E) None of the above.Draw the products of the reaction of xylulose-5-phosphate and erythrose-4-phosphate catalyzed by transketolase in the pentose phosphate pathway. Provide the structure in the protonation state found in physiological conditions. H H H OH FO HO-H H-OH H OPO3²- Q transketolase Draw glyceraldehyde-3- phosphate H H- H H H O OH OH OPO3²- Draw fructose-6- phosphate Q I I
- a-Keto acids other than a-ketoglutarate can accept the amino group from pyridoxamine in enzyme-catalyzed transamination reactions. What amino acids are formed when the following a-keto acids accept the amino group?O OO O Opyruvate oxaloacetateWhich one of the following regarding the chemistry of glycolysis & gluconeogenesis is FALSE? Reaction 6 of glycolysis catalyzed by glyceraldehyde-3-phosphate dehydrogenase involves oxidation & addition of a P; group. Reaction 3 of gluconeogenesis catalyzed by enolase involves hydration, the addition of water to a carbon-carbon double bond (C=C) to form an alcohol. Reaction 1 of gluconeogenesis catalyzed by pyruvate carboxylase involves decarboxylation. Reaction 9 of gluconeogenesis catalyzed by fructose-1,6-bisphosphatase involves dephosphorylation (phosphoester hydrolysis). Reaction 1 of glycolysis catalyzed by hexokinase involves phosphorylation (using ATP). O 0000(b) ☐ The exergonic reactions catalyzed by isocitrate dehydrogenase (ICDH) and α- ketoglutarate dehydroge-nase (aKGDH) are regu- lated by metabolites, in addition to the reaction catalyzed by citrate synthase. The diagram to the right illustrates the activity of ICDH (A,▲) and aKGDH (O,●) in the presence of 1.5 mM ADP (O,A) or 1.5 mM ATP (●,▲). In muscle tissue contraction of sarcomeres initiated by a nerve im- pulse results first in the release of Ca 2+ from the sarcoplasmic reticulum. As indicated by the chang- es in velocity of the two enzymes, what are the flux changes of the TCA cycle in muscle tissue upon release of Ca2+ under the influence of ADP viz. ATP and under the influence of NAD+ viz. NADH on cit- rate synthase? 100 75 Stimulation of activity (% of maximum) ŏ 25 1. -8 -7 -6 log {[Ca2+] (M)}
- If a liver extract capable of carrying out normal metabolic reactions (including gluconeogenesis) is incubated with labeled pyruvate labeled with carbon-13 at the carbonyl carbon atom (shown in red below), where would the label be found in glucose? Explain, including schemes of the reactions to support your answer. 13 H3C coo®Which 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. Transferaseasap
- Which one of the following statements about coenzyme A is correct? The biosynthesis of coenzyme A requires vitamin B12 O The thioester of acetyl-coenzyme A raises the pka value of the alpha-proton O Hydrolysis of acetyl-coenzyme A is thermodynamically favourable O Acetyl-coenzyme A is involved in the biosynthesis of S-adenosylmethoinineWhy does it make good metabolic sense for phosphoenolpyruvate carboxykinase, rather than pyruvate carboxylase, to be the primary target for regulating gluconeogenesis at the level of control of enzyme synthesis?Fatty acids are converted to their coenzyme A esters in a reversible reaction catalyzed by acyl-CoA synthetase: R-COO +ATP +COA R-C-COA +AMP + PPi a) The reaction involves two steps the first of which forms an enzyme-bound intermediate identified as the mixed anhydride of the fatty acid and AMP: R-C-O-P-O-nibose-adenine Write two chemical equations coresponding to the two steps of the reaction catalyzed by the synthetase. b) The acyl-CoA synthetase reaction as written above is readily reversible. How might the reaction be made to favor formation of fatty acyl-CoA? Write within the box. Anything outside the box will not be graded. From the