Environmental Biotechnology章节测试课后答案2024春

第三章测试

1.The idealized biofilm having the following properties except ( ).
A:An effective diffusion layer of thickness L represents external mass-transport resistance.   B:Has a locally uniform thickness of Lf. C:Mass-transport resistance is not important to the biofilm. D:The biofilm has a uniform biomass density.
答案:C
2.The following description of the fundamental “law” of the steady-state biofilm is correct. ( )
A:The growth of new biomass per unit area per hour (YJ   T) is just balanced by the losses per unit area b’XfLf. B:The growth of new biomass per unit area (YJ ) is just balanced by the losses per unit area b’XfLf. C:The growth of new biomass per unit area per hour (YJ   T) is just balanced by the losses. D:The growth of new biomass (YJ ) is just balanced by the losses per unit area b’XfLf. 3.The model of a steady-state biofilm requires simultaneous solution of ( ).
A:mass-balance for substrate transport to the biofilm. B:mass-balance for substrate in the biofilm. C:mass-balance for active biomass in the biofilm D:boundary and continuity conditions. 4.The following figures shows that ( ).
A:At some value of S>Smin, the slope of J versus S declines from near infinity and approaches 1.0. B:J and XfLf increases very sharply as S increases slightly above Smin. C:For very large S, the slope of J versus S declines gradually and eventually approaches the limiting case of one-half-order kinetics, or J=k1/2S1/2 . D:For S large enough, J (and XfLf) increases for larger S, because the substrate concentrations inside the biofilm rise in response to a higher S. 5.The result of mass-transport resistance is that the substrate concentrations at any position in the biofilm usually are lower than in the bulk liquid. ( )
A:错 B:对 6.Two biofilms having the same physical thickness, should have similar values. ( )
A:错 B:对 7.The fundamental understanding of a steady-state biofilm is that the biomass per unit surface area (XfLf) is constant in time, and the biomass at any one location is at steady state. 
A:错 B:对 8.S*min represents the growth potential in the steady-state-biofilm model, and S*min much less than 1.0 indicates the net positive growth is much greater than the loss. (   )
A:错 B:对 9.K* compares external mass transport to the maximum utilization rate. K* less than 1 means that the substrate utilization is controlled by external mass transport. ( )
A:错 B:对 10.For deep biofilm, it has the maximum flux into the biofilm. ( )
A:错 B:对