The transport rate reaches a maximum when:

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(B) Facilitated diffusion is a process that requires specific membrane proteins to move molecules across the cell membrane.Because the number of these

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All of the protein transporters are being used.

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(B) Facilitated diffusion is a process that requires specific membrane proteins to move molecules across the cell membrane.Because the number of these protein transporters is limited,the transport rate increases with an increase in the concentration gradient up to a point.Once all the protein transporters are saturated (i.e.,all are occupied by substrate molecules),the transport rate reaches its maximum and cannot increase further,even if the concentration gradient is increased.This phenomenon is known as saturation kinetics.

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