Match the wastewater treatment step in Column A with its primary objective in Column B

Column A (Step)	Column B (Objective)
1. Bar Screens	i. Removal of dissolved nitrates and phosphates
2. Grit Chamber	ii. Removal of large floating objects (plastics, rags)
3. Secondary Clarifier	iii. Settlement of sand, gravel, and heavy inorganic solids
4. Tertiary Treatment	iv. Separation of biological flocs (activated sludge)

#Question id: 449

#Biochemistry

The standard free-energy changes for the reactions below are given. Phosphocreatine -> creatine + Pi DG'° = –43.0 kJ/mol ATP ->  ADP + Pi DG'° = –30.5 kJ/mol What is the overall DG'° for the following reaction? Phosphocreatine + ADP -> creatine + ATP

#Question id: 450

#Biochemistry

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

#Biochemistry

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

#Biochemistry

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

#Biochemistry

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

#Biochemistry

Which statement is false about most metabolic pathways?