Concept explainers
Interpretation:
The anion that is represents by the abbreviated PPi. have to be identified from the given options.
Concept Introduction:
cAMP is a cyclic
Enzymes are proteins that increase the
Secondary messengers are short lived intracellular signaling molecules. Elevated concentration of these types of messengers leads to rapid alteration in the activity of one or more cellular enzymes.
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- Carboxylic acids, such as the one shown below, can be difficult to reduce Provide the name of a reductant A. Explain why this reductant is able to react with the carboxylic acid whereas others cannot (Hint: Draw and discuss the potential reactive intermediates/transition states).arrow_forwarda) The equilibrium reaction for the aqueous dissociation of acetic acid is shown below. CH3COOH(aq) = CH3COO-(aq) + H+ (aq) Given the data in the table below and your knowledge of the "chemical standard state" (X) and the “biochemical standard state” (Xº'), answer parts a) to e). c) For the dissociation of acetic acid at 298.15 K, calculate AG and the corresponding pK₁. b) Even though by definition, AfG©(H+ (aq)) = 0 and_AƒGº¹(H+(aq)) = 0, these are different physical quantities. What precisely does each represent? Calculate at 298.15 K, AG' for CH3COOH(aq) and CH3COO¯(aq). Gibbs free energy of formation, in units of kJ mol-¹, at T = 298.15 K AfGe A¢G° -396.5 -369.3 0 CH3COOH(aq) CH3COO- (aq) H+ (aq) d) For the dissociation of acetic acid at 298.15 K, calculate ArGº¹. LOXF 0 Finally, using the formula to convert between standard states, show that that your calculated values of AG and A.Gº are in agreement. jonly thisarrow_forwardAcid phosphatases are an important group of enzymes that can be detected in human blood serum. Under slightly acidic conditions (pH 5.0), this group of enzymes can hydrolyze biological phosphate esters as follows: R-O-P-O;² + H 20 → R-OH + HO-P-O;² Acid phosphatases are produced and can be detected in erythrocytes, kidney, spleen, the liver, and prostrate gland. The enzyme from the prostrate gland is clinically important because an increased activity in the blood is frequently an indication of cancer of the prostrate gland. Tartrate ion can strongly inhibit the phosphatase from the prostrate gland, but not acid phosphatases from other tissues. How can you use the information above to develop a specificarrow_forward
- Lithium ion inhibits the synthesis of inositol trisphosphate by inhibiting a reaction in the breakdown of inositol trisphosphate.Explain this apparent paradox.arrow_forwardWrite a balanced equation for cach of the following reactions or reaction sequences. (a) The reaction catalyzed by PFK-2 (b) The conversion of 2 moles of oxaloacetate to glucose (c) The conversion of glucose to UDP-Gle (d) The conversion of 2 moles of glycerol to glucose (e) The conversion of 2 moles of malate to glucose-6-phosphatearrow_forwardLithium ion inhibits the synthesis of inositol trisphosphate by inhibiting a reaction in the breakdown of inositol trisphosphate. Explain this apparent paradox.arrow_forward
- Using Figure 1.3 of the Introduction as an example, a) draw all the structures of the tribasic amino acid lysine involved in the equilibrium reactions that would take place during titration against NaOH, starting with the fully protonated form below (draw the R-group in full). HAN+-CH- COOH (CH2)4 NH°+ b) indicate the numerical pa value of each equilibrium reaction, and which ionizable group is being dissociated in each step. c) indicate the net charge of the amino acid at each step and identify the zwitterion. d) Calculate the pI of this amino acid (show the calculation). e) What would be the predominant ionization states of this amino acid at physiological pH (7.4) and at this pH, what would the ratio of these two states be (show the calculation)?arrow_forwardDraw dipeptide Arg-Thr at pH 6.0. Circle the six atoms that are restricted in one plane. Calculate its approximate pI assuming pKa for NH3+ is 10.0, pKa for COOH is 3.0, PKR for Arg is 12.0arrow_forwardAcid phosphatases are an important group of enzymes that can be detected in human blood serum. Under slightly acidic conditions (pH 5.0), this group of enzymes can hydrolyze biological phosphate esters as follows; R-O-P-O3-2+ H 20 OR-OH + HO-P-O3-2. Acid phosphatases are produced and can be detected in erythrocytes, kidney, spleen, the liver, and prostate gland. The enzyme from the prostate gland is clinically important because an increased activity in the blood is frequently an indication of cancer of the prostate gland. Tartrate ion can strongly inhibit the phosphatase from the prostate gland, but not acid phosphatases from other tissues. How can you use the information above to develop a specific procedure for measuring the activity of the acid phosphatase of the prostate gland in human blood serum?arrow_forward
- (i) During the Pyruvate Decarboxylase (PDC) catalysed reaction, a covalent coenzyme intermediate is formed. On the skeleton of the covalent coenzyme intermediate below draw the appropriate double bonds, charges, and electron pairs to illustrate the two resonance forms of this intermediate. Name each form in the boxes provided. HO S R' N -R HO S R' N -Rarrow_forwardStearidonic acid (C18H28O2) is an unsaturated fatty acid obtained from oils isolated from hemp and blackcurrant (see also Problem 10.11). a. What fatty acid is formed when stearidonic acid is hydrogenated with excess Hạ and a Pd catalyst? b. What fatty acids are formed when stearidonic acid is hydrogenated with one equivalent of Hz and a Pd catalyst? c. Draw the structure of a possible product formed when stearidonic acid is hydrogenated with one equivalent of H2 and a Pd catalyst, and one double OH stearidonic acid bond is isomerized to a trans isomer. d. How do the melting points of the following fatty acids compare: stearidonic acid; one of the products formed in part (b); the product drawn in part (c)?arrow_forward[References) The AG" for the reaction ATP + H₂O ADP + P + H+ is -30.5 kJ mol'¹, Other organophosphate species also undergo hydrolysis of the phosphate moiety via a similar reaction. Determine the value of AG for the following reactions and indicate if the reaction will proceed spontaneously in the direction written if the reactants and products are initially in a 1:1 molar ratio. a. ATP + Glucose ADP+ Glucose-1-phosphate AG⁹¹ = kJ mol-1 The reaction is (The hydrolysis reaction for glucose-1-phosphate is Glucose-1-phosphate + H₂0 Glucose + P + H+; AG-20.9 kJ mol ¹.) b. ATP + Glutamate Carbamoyl phosphate + ADP AG The reaction is kJ mol-1 (The hydrolysis reaction for carbamoyl phosphate is Carbamoyl phosphate + H₂0 Glutamate + P, + H+ ; AG¹ = -51.4 kJ mol ¹.) Submit Answer Try Another Version 3 item attempts remainingarrow_forward
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