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Cells require glucose as a source of energy to carry out life processes. Large molecules like glucose cross the cell’s plasma membrane by..

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Cells require glucose as a source of energy to carry out life processes. Large molecules like glucose cross the cell's plasma membrane by...

Facilitated diffusion through protein channels (Glucose enters a cell by facilitated diffusion through protein channels. Since the molecules are too big to move directly through the semipermeable membrane, there are built-in protein channels to facilitate the movement glucose into the cell. Because the glucose is moving with the concentration gradient, the channel helps the movement; no energy is expended. Active transport requires the use of energy to move molecules or ions against the concentration gradient. 

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Histrionicus

Answer:

The correct answer is - Facilitated diffusion through protein channels.  

Explanation:

Glucose is a large molecule which is a 6- carbon sugar that stored energy for cellular functions. As it is a macromolecule that is difficult to move across the cell membrane by simple diffusion.

The facilitated diffusion is the process that helps large molecules to pass through the plasma membrane down the concentration gradient with the help of protein channels. As the glucose moves down the gradient by this process there is no need for energy as channels regulate the movement of molecules.

Thus, the correct answer is - Facilitated diffusion through protein channels.

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