Question

question 4
the primary structural components of the cell membrane are ...
phospholipids and cellulose
phospholipids and proteins
cholesterol and proteins
proteins and cellulose
glycoproteins and cholesterol

Explanation:

Cell membranes are primarily made of a phospholipid bilayer. Phospholipids form the basic structure, and proteins are embedded in or associated with this bilayer. Cellulose is a component of plant cell walls (not cell membranes). Cholesterol is present in animal cell membranes but is not a primary structural component like phospholipids. Glycoproteins (proteins with attached carbohydrates) are involved in cell - cell recognition but are not the main structural components.

Answer:

phospholipids and proteins