The reduction potential of NADH is -320 mV. To which one of the following electron carriers could NADH donate electrons? 1. -120 mV mV b. -400 mV d. +0.50 mV O Choices (a) and (b) O Choices (a), (d) and (e) O Choices (d) and (e) O Choices (a), (b) and (c) O Choices (a) through (e) c. -320 e. +120 mV
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- In the following representation of stepwise electron flow through the respira- tory chain, replace the question marks with suitable parameters being judged. -0.4 NADH 240 -0.2 FMN, 200 0.0 160 0.2 120 0.4F cyt c 80 0.6 40 0.8 (a) ? (b) ?Given what you know about the involvement of nicotinamide nucleotides inoxidative and reductive metabolic reactions, predict whether the followingintracellular concentration ratios should be 1, > 1, or < 1. Explain youranswers.(a) [NAD+] >[NADH](b) [NADP+] >[NADPH](c) Since NAD+ and NADP+ are essentially equivalent in their tendency to attract electrons, discuss how the two concentration ratios might bemaintained inside cells at greatly differing values.Given what you know about the involvement of nicotinamide nucleotides in oxidative and reductive metabolic reactions, predict whether the following intracellular concentration ratios should be (1) unity, (2) greater than unity, or (3) less than unity. Explain your answers. (a) [NAD*]/[NADH] (b) [NADP*]/[NADPH] Because NAD* and NADP* are essentially equivalent in their ten- dency to attract electrons, discuss how the two concentration ratios might be maintained inside cells at greatly differing values.
- Just how much free energy is released via the passage of enough hydrogen ions through the ATP synthetase (F0F1 complex) to turn the gamma subunit (attached to the cam) TWO full 360 degrees revolutions? (0) (7) (14) (21) (42) (>42) kilocalories/mole. All choices are considered to be negative delta Gs. Briefly explainCalculate the biochemical standard cell potential for the oxidation of NADH by molecular oxygen O2 + 2NADH + 2 H+ → 2H2O + 2NAD+. The reduction potential of FAD/FADH2 is -0.22 V and that of CoQ/CoQH2 is 0.06V. (a) If electrons were allowed to pass between the 2 electron carriers (FAD/FADH2 and CoQ/CoQH2), ___________________ would be the electron donor. (b) Calculate the ΔG0’ for a 2 electron transfer between these two electron carriers. Faraday’s constant is 96.5kJ V-1 mole-1
- Given the following information on reduction potentials, calculate the standard free energy in kJ/mol based on your understanding of electron transfer through the pyruvate dehydrogenase complex. Round to nearest whole number. Lipoamide + 2H+ + 2e- → dihydrolipoamide ∆εο = -0.29 FAD + 2H+ + 2e- → FADH2 ∆εο = −0.01Your current Vmax (4x10-3 A/S) from the Michaelis-Menten plot has the units of A/s and was determined using 0.1 mg of ADH in a total volume of 1.25 mL. Use the Beer-Lambert equation followed by simple conversion to express your estimated Vmax in (mol )/s per 1 mg ADH. The molar absorptivity of NADH at 340 nm is 6220 L/(mol*cm).(a) Consider the oxidation of malate to oxaloacetate by NAD*: malate + NAD+ → oxaloacetate + NADH + H+ In yeast mitochondria, where the pH = 8.1, this reaction is exergonic only at low oxaloacetate concentrations. Assuming a pH = 8.1, a temperature of 37 °C, and the steady-state concentrations given below, calculate the maximum concentration of oxaloacetate at which the reaction will still be exergonic. malate + NAD*→ oxaloacetate + NADH + H* lactate + NAD →→ pyruvate + NADH + H+ half reaction Pyruvate + 2H+ + 2e → lactate Pyruvate + CO₂ + H + 2e → malate Intracellular steady state concentrations: malate = 410 μM; NAD = 20.0 mM; pyruvate = 3.22 mM; NADH = 290 μM; AG=+29.7 kJ/mol AG¹ = +25.1 kJ/mol E° (V) - 0.190 - 0.330 lactate 1.1 mM CO₂ = 15.5 torr
- The enzyme lactate dehydrogenase catalyzes the reversible reaction lactate (CH3 CHOHCOO )+NAD* рyruvate (CH3 COCOO) + NADH + H+ Given the standard reduction potentials CH3 СОСОО + 2H+ + 2е CH3 CHОНСО" E°'= -0. 185 V NADŤ + H+ + 2e- → NADH = -0. 320 V E°' would you expect the reaction to be spontaneous in the forward or reverse direction under biochemical standard state conditions? How could you change the reaction conditions to force the reaction to be spontaneous in the opposite direction? Please explain your answer.The standard free energy variation of the ATP hydrolysis reaction is ΔGº’ = -30.5 kJ / mol ATP + H2O ⇄ ADP + Pi In red blood cells, when the concentration of Pi is 1.6 mM, the real change in energy free is ΔG = - 50'2 kJ / mol. a) Calculate under these conditions what is the ratio [ATP] / [ADP] in the red blood cells. b) Determine the equilibrium constant K 'of the reaction outlined above. c) If the ADP concentration were 0.2mM, what would be the effective concentration of ATP corresponding to equilibrium.A dialyzed pigeon liver extract will catalyze the conversion of acetyl-CoAto palmitate and CoASH if supplied with Mg2+, NADPH, ATP, HCO3-, andcitrate.(a) If H14CO3– is supplied, what compounds will become labeled (permanently or transiently) during the course of the reaction? In whatcompounds will 14C accumulate?(b) Explain the role of citrate in this reaction.