Question

which is more likely to diffuse through the cell membrane?
a carbon dioxide
b starch
c protein
d dna

Explanation:

The cell membrane is selectively permeable, allowing small, non - polar, or uncharged molecules to diffuse easily. Carbon dioxide ($\ce{CO_2}$) is a small, non - polar gas molecule. Starch is a large polysaccharide, protein is a large macromolecule, and DNA is also a large macromolecule. These large molecules are too big to diffuse through the cell membrane easily. So carbon dioxide is more likely to diffuse through the cell membrane.

Answer:

a. carbon dioxide