Question

question 6 of 15
if structure x is removed from the membrane shown below, which substance listed will become unable to cross the membrane?

a. nitrogen (n₂), due to its charge
b. carbon dioxide (co₂), due to its polarity
c. oxygen (o₂), due to its electronegativity
d. glucose, due to its size

Explanation:

Structure X appears to be a transport protein. Small non - polar molecules like nitrogen ($N_2$), carbon dioxide ($CO_2$), and oxygen ($O_2$) can cross the lipid - bilayer membrane by simple diffusion. Glucose is a large polar molecule that requires transport proteins to cross the membrane.

Answer:

D. Glucose, due to its size