Question

Cell membrane can pass easily Oxygen and Carbon dioxide.

(a) False

(b) True

I had been asked this question in final exam.

Query is from Gastrointestinal Absorption of Drugs topic in portion Absorption of Drugs of Drug Biotechnology

Answer 1

Right option is (b) True

To explain: Oxygen being small and nonpolar can easily pass through the membrane and carbondioxide is also small enough to easily diffuse in and out of the cell. Small hydrophobic molecules and small uncharged polar molecules can easily pass through the cell membrane. Larger uncharged polar molecules and ions find it difficult to cross the cell membrane.