In the context of solute transport, what does the constant kt represent, and how is it analogous to Km in enzyme kinetics?

• A. kt represents the affinity of the transporter for the solute, similar to kcat in enzyme kinetics.
• B. kt represents the solute concentration at which transport rate is half-maximal, similar to Km in enzyme kinetics.
• C. kt represents the rate of solute transport, similar to kcat in enzyme kinetics.
• D. kt represents the maximum rate of solute transport, similar to Vmax in enzyme kinetics.

Answer: (B)