Which of the following cellular structures is richest in lipid content?

• A. Ribosome
• B. Golgi apparatus
• C. Plasma membrane
• D. Nucleolus

Answer: (C)

Verified step by step guidance

1. Understand the composition of cellular structures: Cellular structures are made up of different biomolecules, including lipids, proteins, and nucleic acids. Lipids are primarily found in membranes, which serve as barriers and structural components in cells.
2. Analyze the plasma membrane: The plasma membrane is a lipid bilayer composed mainly of phospholipids, cholesterol, and proteins. Its lipid content is essential for maintaining fluidity and selective permeability.
3. Compare the lipid content of other structures: Ribosomes are composed of RNA and proteins, with no significant lipid content. The nucleolus is involved in ribosome synthesis and is rich in RNA and proteins, not lipids. The Golgi apparatus has membranes but is not as lipid-rich as the plasma membrane.
4. Conclude why the plasma membrane is richest in lipid content: The plasma membrane's primary function as a barrier and its structure as a lipid bilayer make it the cellular structure richest in lipid content.
5. Summarize the reasoning: Based on the composition and function of cellular structures, the plasma membrane is the correct answer because it contains the highest concentration of lipids compared to ribosomes, the Golgi apparatus, and the nucleolus.