Question

As early as 1915, scientists were aware that the cell membrane was composed of ________________________ and _________________.

A) Lipids, Proteins
B) Carbohydrates, Proteins
C) Lipids, Carbohydrates
D) Nucleic Acids, Enzymes

Answer 1

The cell membrane is primarily composed of lipids and proteins, with carbohydrates also present on its exterior surface.

Step-by-step explanation:

As early as 1915, scientists were aware that the cell membrane was composed of lipids and proteins. The principal components of a plasma membrane are lipids, proteins, and carbohydrates. Lipids, including phospholipids and cholesterol, form the bilayer of the cell membrane. Proteins are embedded within this lipid bilayer, which can function as transporters or enzymes. Carbohydrates are attached to these lipids and proteins on the outside surface of the membrane, playing a role in cell recognition and communication. Therefore, the correct answer to the question is A) Lipids, Proteins.