Question

only certain molecules are able to use passive transport to cross the cell membrane. the cell membrane, which is made of a phospholipid bilayer, controls what enters and exits the cell.
the phospholipids in the cell membrane are packed tightly together. the outer parts of the lipid bilayer are polar and hydrophilic. the inner core of the lipid bilayer is nonpolar and hydrophobic. this structure allows only small nonpolar molecules to freely pass through the lipid bilayer.
extracellular environment (outside the cell)
phospholipid
polar head
nonpolar tails
intracellular environment (inside the cell)
select the true statements.
oxygen, a small nonpolar molecule, can freely pass through the lipid bilayer.
positively charged sodium ions can freely pass through the lipid bilayer.
the inner core of the lipid bilayer attracts polar molecules like water.
the outer parts of the lipid bilayer attract polar molecules like water.

Explanation:

Oxygen is small non - polar and can pass. Outer parts are polar and attract water. Inner core is non - polar and repels polar molecules. Charged sodium ions can't pass freely.

Answer:

Oxygen, a small nonpolar molecule, can freely pass through the lipid bilayer.
The outer parts of the lipid bilayer attract polar molecules like water.