The cell membrane is made up of what ?

The cell membrane is made up of what?

Proteins and lipids.

Lipids form a double layer that prevents water-soluble substances from passing through cells.

Proteins create channels that control the entry and exit of these substances into cells.

i think it's c

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.