The correct answer is D. Lipid soluble substances can pass more easily through cell membranes than other substances. This is because cell membranes are made up of lipids, which are fatty molecules. Lipid soluble substances can dissolve in the lipids of the cell membrane and therefore pass through the membrane more easily.
Peptides are soluble in water, but not in lipids. This means that they cannot pass through the cell membrane as easily as lipid soluble substances.
Nucleic acids are also soluble in water, but not in lipids. Therefore, they cannot pass through the cell membrane as easily as lipid soluble substances.
Cellulose is a type of carbohydrate that is not soluble in water or lipids. Therefore, it cannot pass through the cell membrane at all.
In conclusion, lipid soluble substances can pass more easily through cell membranes than other substances. This is because cell membranes are made up of lipids, which are fatty molecules. Lipid soluble substances can dissolve in the lipids of the cell membrane and therefore pass through the membrane more easily.