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  • Which of the following statements regarding membrane transport is false?  Option: 1 Polar and charged solut

Which of the following statements regarding membrane transport is false?

 

Option: 1

Polar and charged solutes will not cross cell membranes effectively without specific protein carriers.


Option: 2

Each protein carrier will only bind and transport one (or a few very similar) types of solute.


Option: 3

Sugars such as glucose are always transported by active transport rather than by facilitated diffusion carriers.


Option: 4

Ions are typically transported by special proteins that form membrane channels.


Answers (1)

Sugars such as glucose can be transported by both active transport and facilitated diffusion carriers, depending on the specific context and the concentration gradient of the sugar.

Active transport and facilitated diffusion are two different mechanisms used for transporting molecules across cell membranes. In the case of glucose, both mechanisms are involved in its transport, depending on the concentration gradient and cellular requirements.

Active transport of glucose occurs when the concentration of glucose inside the cell needs to be increased against its concentration gradient. This process requires the expenditure of energy, typically in the form of ATP, to move glucose molecules from an area of lower concentration to an area of higher concentration.

Facilitated diffusion, on the other hand, does not require energy input and relies on the concentration gradient of the sugar. Facilitated diffusion carriers, such as glucose transporters (GLUT proteins), assist in the transport of glucose down its concentration gradient across the cell membrane. These transporters facilitate the movement of glucose molecules by undergoing conformational changes.

In certain situations, the transport of glucose may predominantly rely on active transport, such as in the absorption of glucose in the intestines or reabsorption in the kidneys, where glucose needs to be transported against its concentration gradient.

However, in many other tissues and cells, facilitated diffusion carriers play a significant role in glucose transport. For example, GLUT proteins are responsible for the facilitated diffusion of glucose in various cells, including muscle, adipose tissue, and the brain.

To summarize, the transport of sugars like glucose can occur through both active transport and facilitated diffusion carriers, depending on the specific conditions and requirements of the cell or tissue.

Therefore, statement C is wrong. Hence, the correct answer is option 3.

Posted by

Ramraj Saini

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