Question

Which of the following is not true of the carrier molecules involved in facilitated diffusion?

Answer 1

Carrier proteins are involved in passive transport, moving solute molecules form one side of the membrane to the other. Option (A) is not true. They increase the speed of transport across the membrane.

Facilitated diffusion

• It is the transport of hydrophilic molecules that can not freely cross the membrane.

• Channel protein and many carrier proteins are in charge of this transport.

• When uncharged molecules cross the membrane, they do it according to their concentration gradients, going from the more concentrated side to the lower concentrated one.

• When ions need to cross the membrane, the process depends on an electrochemical gradient

Carrier molecules

• Carrier proteins move molecules from one side of the membrane to the other side.

• They do not need energy. They move solutes according to the electrochemical gradient.

• The carrier proteins have specific binding sites recognized by the transported molecules.

• When the proteins and the solutes get together, the carrier proteins suffer a temporal change in their structure.

• These changes allow the solute passage to the other side of the membrane.

Options,

(A) They increase the speed of transport across the membrane. FALSE

(B) They concentrate solute molecules on one side of the membrane TRUE

(C) They have specific binding sites for the molecules they transport. TRUE

(D) They undergo conformational changes upon binding the solutes. TRUE

The incorrect option about carrier proteins is A. Carrier proteins Do Not increase the speed of transport. They just make it possible.

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