Which cellular structure is primarily composed of a phospholipid bilayer?

• A. The nuclear lamina
• B. The ribosome
• C. The cell wall
• D. The plasma membrane

Answer: (D)

Verified step by step guidance

1. Understand the composition of each cellular structure listed: the nuclear lamina, ribosome, cell wall, and plasma membrane.
2. Recall that a phospholipid bilayer is a double layer of phospholipids with hydrophilic heads facing outward and hydrophobic tails facing inward, forming a fundamental structure of cell membranes.
3. Recognize that the nuclear lamina is a protein network providing structural support to the nucleus, not a phospholipid bilayer.
4. Know that ribosomes are composed of RNA and proteins and are involved in protein synthesis, lacking any lipid bilayer.
5. Identify that the cell wall, found in plants and some other organisms, is made primarily of carbohydrates like cellulose, not phospholipids, whereas the plasma membrane is the cellular structure primarily composed of a phospholipid bilayer.