What chemical structure makes up the cell membrane? protein bilayer hydrophilic phosphate phospholipid bilayer hydrophobic fatty acid

The chemical structure that makes up the cell membrane is phospholipid bilayer.

Explanation:

The cell membrane is a lipid bilayer that delimits the entire cell. It is a structure formed by two sheets of phospholipids, glycolipids and proteins that surround, limit the form and contribute to maintaining balance between the interior (intracellular medium) and the exterior (extracellular medium) of the cells. It regulates the entry and exit of many substances between the cytoplasm and the extracellular medium, similar to the membranes that delimit the organelles of eukaryotic cells.

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