Question

multiple choice question
______ bilayer formation is significant in membrane formation and contributes to the selective permeability and fluid nature of membranes.
o triglyceride
o cholesterol
o fatty acid
o phospholipid

Explanation:

Phospholipids form a bilayer in cell - membranes. This bilayer structure gives membranes their selective permeability (allowing certain substances to pass through while blocking others) and fluid nature. Triglycerides are energy - storage molecules, cholesterol affects membrane fluidity but doesn't form the main bilayer, and fatty acids are components of lipids but not the key bilayer - forming unit for membranes.

Answer:

Phospholipid