Which of the following are characteristics of facilitated diffusion? Choose one

Question

Which of the following are characteristics of facilitated diffusion? Choose one or more: A. It only operates unidirectionally (to move solutes into the cell) B. It represents an important uptake system for bacteria living in dilute aquatic environments. C. Solutes are chemically modified (such as by addition of a phosphate group) as they enter the cell D. It cannot internally concentrate a solute relative to the external environment. O E. It does not require energy expenditure by the cell. F. It involves substrate-specific carrier proteins.

Explanation / Answer

Answer: Here two options that is E and F is correct.

Explanation: According to the definition of Facilitated diffusion the the material first binds to the transport protein and then passes through the membrane. This mechanism occurs when molecules cannot diffuse through the bi-layer by simple diffusion process as the size of molecule is large or the molecule is any charged particle.so thediffusionof these type molecules requires the memberane protein which alter the shape and help in process of diffusion.

So according to the option provided option F is correct as it involves substrate specific carrier proteins.

Now facilitated diffusion is also a type of diffusion mechanism where movement the movement of molecules or ions occurs from a region where they are at a high concentration to a region of lower concentration until equilibrium is reached so this mechanism does not require energy expenditure as it is passive transport mechanism. now option E is also justified as ti does not require energy expenditure by the cell.

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