Some solutes are able to pass directly through the lipid bilayer of a plasma mem

Question

Some solutes are able to pass directly through the lipid bilayer of a plasma membrane, whereas other solutes require a transport protein or other mechanism to cross between the inside and the outside of a cell. The fact that the plasma membrane is permeable to some solutes but not others is what is referred to as selective permeability.

Which of the following molecules can cross the lipid bilayer of a membrane directly, without a transport protein or other mechanism? Select all that apply.

a) proteins
b) water
c) ions
d) sucrose
e) lipids
f) carbon dioxide
g) oxygen

Explanation / Answer

Small uncharged molecules like carbon dioxide, oxygen, water can diffuse freely through a lipid bi-layer, and Lipids also can cross the lipid bi-layer without the aid of any transport protein or other mechanism. However, thelarger polar molecules like proteins, sucrose, and ions require transport protein or other mechanism to corss these molecules through lipid bi-layer.

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