Question

Which statement explains why oxygen molecules easily diffuse across a cell

membrane while DNA molecules do not?
A. Oxygen molecules are more useful to a cell than are DNA
molecules.
O B. DNA molecules contain carbon atoms, while oxygen molecules
have only oxygen atoms.
C. Oxygen molecules are very small, while DNA molecules are very
large.
D. DNA molecules have phosphate groups that the cell membrane
repels.

Answer 1

C.

Oxygen molecules are very small, while DNA molecules are very large.