Question

Integral proteins called porins form channels through both leaflets of the outer membrane, allowing midsized molecules such as glucose to move freely across the outer membrane ?

A) Small ions
B) Large proteins
C) Glucose and midsized molecules
D) Lipids

Answer 1

Porins are integral proteins that create channels allowing glucose and midsized molecules to pass through the cell membrane.

Step-by-step explanation:

Integral proteins called porins function as channels in the cell membrane, allowing the passage of certain substances. These transport proteins are critical for facilitating the movement of molecules that cannot freely diffuse across the hydrophobic lipid bilayer due to their size or polarity. In the context of the question, porins enable glucose and midsized molecules to move freely across the outer membrane of a cell by providing a hydrophilic pathway that bypasses the nonpolar central layer of the plasma membrane.

So, the answer to the student's question would be: C) Glucose and midsized molecules.