Which of the following are the primary components of the cell membrane?

• A. Carbohydrates and cellulose
• B. Proteins and lipids
• C. Cellulose and carbohydrates
• D. Proteins and cellulose

Answer: (B)

Verified step by step guidance

1. Understand the structure and function of the cell membrane: The cell membrane is a selectively permeable barrier that surrounds the cell, controlling the movement of substances in and out of the cell.
2. Identify the primary components of the cell membrane: The cell membrane is primarily composed of a phospholipid bilayer and embedded proteins. Lipids provide the structural framework, while proteins perform various functions such as transport, signaling, and structural support.
3. Eliminate incorrect options: Carbohydrates and cellulose are not primary components of the cell membrane. Cellulose is a structural polysaccharide found in plant cell walls, not in the cell membrane.
4. Clarify the role of carbohydrates: While carbohydrates are present in the cell membrane, they are not primary components. They are attached to lipids (glycolipids) or proteins (glycoproteins) and play roles in cell recognition and signaling.
5. Conclude with the correct answer: The primary components of the cell membrane are proteins and lipids, as they form the structural and functional basis of the membrane.