#Question id: 450
#Unit 1. Molecules and their Interaction Relevant to Biology
The DG'° values for the two reactions shown below are given.
Oxaloacetate + acetyl-CoA + H2O -> citrate + CoASH DG'° = –32.2 kJ/mol
Oxaloacetate + acetate -> citrate DG'° = –1.9 kJ/mol
What is the DG'° for the hydrolysis of acetyl-CoA?
Acetyl-CoA + H2O -> acetate + CoASH + H+
#Question id: 451
#Unit 1. Molecules and their Interaction Relevant to Biology
The standard reduction potentials (E'°) for the following half reactions are given.
Fumarate + 2H+ + 2e– -> succinate E'° = +0.031 V
FAD + 2H+ + 2e– -> FADH2 E'° = –0.219 V
If you mixed succinate, fumarate, FAD, and FADH2 together, all at l M concentrations and in the presence of succinate dehydrogenase, which of the following would happen initially?
#Question id: 452
#Unit 1. Molecules and their Interaction Relevant to Biology
E'° of the NAD+/NADH half reaction is –0.32 V. The E'° of the oxaloacetate/malate half reaction is –0.175 V. When the concentrations of NAD+, NADH, oxaloacetate, and malate are all 10–5 M, the “spontaneous” reaction is:
#Question id: 453
#Unit 1. Molecules and their Interaction Relevant to Biology
Which statement does not explain why many biochemical processes are carried out via multi-step pathways rather than by single-step reactions (or only a few steps)
#Question id: 454
#Unit 1. Molecules and their Interaction Relevant to Biology
Which statement is false about most metabolic pathways?
#Question id: 455
#Unit 1. Molecules and their Interaction Relevant to Biology
Which of the following is correct for a step in a reaction pathway to serve as a control point
A) irreversible B) endergonic C) far from equilibrium