Question

question 21 of 32
move easily through the lipid bilayer of the plasma membrane
need help from a protein to cross the membrane because they are repelled by the lipid bilayer
answer bank
glucose
oxygen
potassium ions
sodium chloride
amino acids

Explanation:

The lipid bilayer is hydrophobic. Small nonpolar molecules like oxygen dissolve in lipids and pass easily. Polar molecules (glucose, amino acids) and charged ions (potassium ions, sodium chloride) are repelled by the hydrophobic core, so they require protein transporters or channels.

Answer:

Move easily through the lipid bilayer: oxygen
Need help from a protein to cross the membrane: glucose, potassium ions, sodium chloride, amino acids