What characteristics does a cell membrane have that the plastic bag does not have?

The characteristic that differentiates the cell membrane from a plastic bag is that the membrane is permeable to the passage of substances.

Explanation:

Cell membrane covers the cell and is predominantly formed by a double layer of lipids, which gives it the main characteristic of behaving as a semi-permeable membrane. This indicates that the membrane allows the entry of some substances and prevents the entry of others.

Unlike the cell membrane, a plastic bag is impermeable, preventing the passage of water or any other substance.

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.

idk about that one.