Assumed properties of transport kinetics   Predicted effect on transport  
First in, last out
Rate-limiting step
Inhibition by H+

Inhibition by Lac-
Proton (H+) binding/release of H+ Yes Yes
  binding/release of Lac- Yes No
  translocation of empty carrier Yes No
  translocation of loaded carrier Yes No
Lactate (Lac-) binding/release of H+ No Yes
  binding/release of Lac- Yes Yes
  translocation of empty carrier No Yes
  translocation of loaded carrier No Yes
Table 1: Predicted effect on transport for the different model configurations.