Question

question 9
small non - polar molecules are able to go through the cell membrane. they move through by simple diffusion. examples of these molecules include ___. and it does not take any energy, and is passive transport and moves from high to a low concentration.

a water and amino acids
b water and oxygen
c carbon dioxide and oxygen
d carbon dioxide and glucose

Explanation:

Small non-polar molecules undergo simple diffusion through the cell membrane. Water (polar), amino acids (polar/large), and glucose (polar/large) do not qualify. Carbon dioxide (CO₂) and oxygen (O₂) are small, non-polar, and uncharged, fitting the criteria.

Answer:

c. carbon dioxide and oxygen