20 Adenosine triphosphate (ATP) is the main energy currency used in cells. ATP hydrolysis is coupled with unfavorable reactions,making the net change in energy for the set of reactions less than 0, which is favorable. Although ATP is the main energycurrency, other molecules can fulfill this role and take part in coupled reactions.Determine whether each of the phrases or examples describes a thioester, reduced cofactor, or phosphorylated compound.ThioestersThese compounds accept electrons duringthe oxidation of substrates. Energy isreleased when they are oxidized.the sulfur-carbon bondis hydrolyzedacetyl-CoAReduced cofactorsAnswer Bankthese compounds yieldHPO upon hydrolysisphosphoenolpyruvatePhosphorylated compoundsNADH

The structure of ATP comprises of a nucleoside triphosphate, consisting of a nitrogenous base…

Answered: Adenosine triphosphate (ATP) is the…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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For each pair of biomolecules, identify the type of reaction (oxidation‑reduction, hydrolysis, isomerization, group transfer, or internal rearrangement) required to convert the first molecule to the second. In each case, indicate the general type of enzyme and cofactor(s) or reactants required, and any other products that would result. A(n) (hydrolysis, oxidation reduction, group transfer, isomerization, internal rearrangment) reaction converts glycerol to glycerol 3‑phosphate. This reaction requires (ADP and a kinase, ATP and a phosphatase, ATP and a kinase, ADP and a phosphatase).
For each pair of biomolecules, identify the type of reaction (oxidation‑reduction, hydrolysis, isomerization, group transfer, or internal rearrangement) required to convert the first molecule to the second. In each case, indicate the general type of enzyme and cofactor(s) or reactants required, and any other products that would result. A(n) (hydrolysis, oxidation reduction, group transfer, isomerization, internal rearrangment) reaction converts glucose to fructose. This reaction is catalyzed by a(n) (dehydrogenase, isomerase, kinase, phosphatase).
A glycolytic intermediate may be used to make the glycerol 3-phosphate necessary for the production of glycerophospholipids. For this conversion, provide a reaction sequence.
The formation of maltose, a disaccharide, from two glucose molecules, is not energetically favorable. However, if this reaction is coupled with the hydrolysis of ATP, the reaction occurs more favorably. Maltose + H2O = 2 Glucose , ΔG'o = -15.5 KJ/mol or -3.7 kcal/mol a. Determine if the coupled reaction will occur spontaneously at standard state through calculating the Gibbs Free Energy of Reaction. b. Calculate the equilibrium constant for each individual reaction, and for the coupled reaction (using free energy of reaction). Show that the equilibrium constant for the coupled reaction equals the equilibrium constants for the individual reactions multiplied together. c. If the reaction medium contains the following chemical species at their given concentrations (298 K and 1.0 atm, pH = 7.0), will the reaction proceed in the forward or the reverse direction? [Maltose] = [Glucose] = 10.0 mM; [ATP] = 5.0 mM; [ADP] = [Pi] = 20 mM
The table lists the standard free energies (AG°') of hydrolysis of some phosphorylated compounds. Compound Phosphoenolpyruvate (PEP) 1,3-Bisphosphoglycerate (1,3-BPG) Creatine phosphate ATP (to ADP) Glucose 1-phosphate Pyrophosphate (PP;) Glucose 6-phosphate Glycerol 3-phosphate kJ mol-¹ -61.9 -49.4 -43.1 -30.5 -20.9 -19.3 -13.8 -9.2 kcal mol-1 -14.8 -11.8 -10.3 -7.3 -5.0 -4.6 -3.3 -2.2
The protein catalase is an enzyme that catalyzes the decomposition of hydrogen peroxide:2 H2O2 (aq) → 2 H2O (l) + O2 (g)and has a Michaelis-Menten constant of 25 × 10-3 mol·dm-3 and a turnover number of 4.0×107s-1.The total enzyme concentration is 0.016×10-6 mol·dm-3 and the initial substrate concentration is4.32×10-6 mol·dm-3 Calculate the maximum reaction rate (????) for this enzyme, and the initial rateof this reaction. Note that catalase has a single active site.
Consider an enzyme (P) that gets activated by forming a dimer (P2): 2P = P2 At 25 °C, we have AH- 19 kJ/mol and AS-65 kJ/mol, for this dimerization reaction. Identify the correct statement. O The enzyme is activated when kept at temp = +37 °C. O The enzyme is activated at all temperatures. O The enzyme is activated when kept in the fridge with temp = 4 "C. O The enzyme can never be activated, no matter what the temperature is. O None of the above statements is true.
The pKa for histidine is pKa = 6.1 while that for cysteine is pKa = 8.0 2. Assume that both histidine and cysteine are catalytic groups for a particular enzyme. Assume also that the side chain of cysteine must be in the deprotonated form. Estimate the pH at which the catalytic activity of this enzyme is the maximum and sketch a pH-activity graph.
The plant toxin fluoroacetate (F-CH2COO−) is easily converted to fluorocitrate when an animal ingests the plant. The enzyme aconitase has a high affinity for the 2-fluorocitrate molecule. Consider the purpose of this enzyme and speculate as to why the reaction to produce isocitrate does not occur as planned. Why is fluoroacetate considered a poison? [Hint: Fluorine is more electronegative than oxygen.]
For each pair of biomolecules, identify the type of reaction (oxidation‑reduction, hydrolysis, isomerization, group transfer, or internal rearrangement) required to convert the first molecule to the second. In each case, indicate the general type of enzyme and cofactor(s) or reactants required, and any other products that would result A(n) (hydrolysis, oxidation reduction, group transfer, isomerization, internal rearrangment) reaction converts glycylalanine to glycine and alanine. This reaction requires (NAD+ and a peptidase or protease, ADP and a phosphatase, H2O and a phosphatase, H2O and a peptidase or a protease)
For each pair of biomolecules, identify the type of reaction (oxidation‑reduction, hydrolysis, isomerization, group transfer, or internal rearrangement) required to convert the first molecule to the second. In each case, indicate the general type of enzyme and cofactor(s) or reactants required, and any other products that would result A(n) (hydrolysis, oxidation reduction, group transfer, isomerization, internal rearrangment) reaction converts glycerol to dihydroxyacetone. This reaction requires (NADH and a dehydrogenase, NADH and a phosphatase, NAD+ and a dehydrogenase, NAD+ and a phosphatase) and also produces (NAD+ and H+, NAD+ and H2O, NADH and H+, NADH and H2O).
For each pair of biomolecules, identify the type of reaction (oxidation‑reduction, hydrolysis, isomerization, group transfer, or internal rearrangement) required to convert the first molecule to the second. In each case, indicate the general type of enzyme and cofactor(s) or reactants required, and any other products that would result A(n) (hydrolysis, oxidation reduction, group transfer, isomerization, internal rearrangment) reaction converts L‑leucine to D‑leucine. This reaction is catalyzed by a(n) (dehydrogenase, isomerase, kinase, protease).

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