Cell Structure and Function

The primary reason for the phospholipid bilayer's stability in an aqueous environment is:

• Presence of cholesterol
• High concentration of ions
• Amphipathic nature of phospholipids
• Strong protein interactions

Which statement accurately describes the fluid mosaic model?

• It shows the membrane as a rigid structure
• It shows the membrane as a solid sheet
• It shows the membrane as a dynamic and flexible structure
• It shows the membrane as immobile

Which of the following is a characteristic of peripheral proteins?

• They span the entire membrane
• They are covalently bonded to lipids
• They are loosely attached to the membrane surface
• They are permanently embedded

Integral membrane proteins are sometimes referred to as:

• Surface proteins
• Floating proteins
• Cytoplasmic proteins
• Transmembrane proteins

Which part of the phospholipid is hydrophobic?

• Phosphate group
• Glycerol backbone
• Sugar molecule
• Fatty acid chains