Cell Structure and Function

Which of the following is NOT a major component of the cell membrane?

• Phospholipids
• Proteins
• Nucleic acids
• Cholesterol

Which of the following best defines the function of the cell membrane?

• Energy production
• Genetic material storage
• Selective permeability and boundary maintenance
• Waste excretion What determines the fluidity of the cell membrane?
• Composition of lipids and presence of cholesterol
• 56
• Amount of carbohydrates
• Size of the cell
• Number of ribosomes

The fluid mosaic model emphasizes:

• Rigid and unchanging structure
• Homogeneous composition
• Dynamic and flexible structure of the membrane
• Uniform protein distribution

Which statement correctly describes the distribution of phospholipids in the membrane?

• They form a single layer
• They cluster together randomly
• They form a bilayer with hydrophilic heads outward
• They are only on the inner leaflet

The role of carbohydrates in the plasma membrane is primarily related to:

• Energy storage
• Structural support
• Signal transduction
• Cell recognition