Facilitated diffusion differs from simple diffusion in that it:

Active transport

Choose odd one out w.r.t. facilitated diffusion.

A researcher is studying facilitated diffusion of a novel solute 'X' across a cell membrane using an artificial lipid bilayer system. They observe that increasing the concentration of X on one side of the membrane increases the rate of transport, but only up to a certain point. Beyond this point, further increases in X concentration do not affect the transport rate. Which of the following BEST explains this observation?

“Porins” are chemically?

    Which of the following pair is selective and specific mode of transport?

Which characteristic distinguishes facilitated diffusion from simple diffusion across a biological membrane?

Aquaporins facilitate the transport of:

In a hypothetical cell, the facilitated diffusion of a solute 'Y' is observed to be significantly faster than predicted by simple diffusion models. However, the transport rate plateaus at high concentrations of Y. Which of the following is the MOST likely explanation for this observation?

If two molecules A & B move in the same direction. This movement can be called

    Consider the following statements and choose the correct answer

I.    Carrier proteins are needed by both facilitated diffusion and active transport and are sensitive to inhibitors that react with protein side chain

II.    Different types of proteins present in the membrane plays a major role in both active as well as passive transport

III.    The carrier proteins needed by facilitated and active transport are specific

IV.    There is no need of energy to pump molecule against a concentration in active transport

V.    Transport rate reaches to saturation point, when all the active proteins are used