Question

substance x is a mostly polar molecule and substance y is a mostly non - polar molecule of a similar size. which will diffuse from the extracellular fluid to the intracellular fluid faster if they are in equal concentrations outside and inside the cell? multiple choice substance x will diffuse faster. substance y will diffuse faster. substance x and substance y will diffuse at the same rate, as they are of equal size and concentration.

Explanation:

Cell membranes are composed of a lipid - bilayer which is non - polar in nature. Non - polar molecules can easily pass through the non - polar lipid - bilayer by simple diffusion. Polar molecules have difficulty passing through the non - polar lipid - bilayer due to repulsion. So, the non - polar molecule will diffuse faster.

Answer:

B. Substance Y will diffuse faster.