Cell Structure and Function

Which of the following best describes the function of membrane proteins?

• Only energy production
• Only structural support
• Only DNA replication
• Transport, signaling, and enzymatic activity

Which part of the phospholipid is oriented toward the interior of the bilayer?

• Polar head
• Phosphate group
• Sugar molecule
• Hydrophobic tail

Which of the following contributes to the glycocalyx?

• Membrane lipids
• Membrane proteins
• Membrane carbohydrates
• Cholesterol

Which of the following best defines membrane selectivity?

• Free diffusion of all molecules
• Complete blockage of ions
• Controlled passage of substances
• Equal distribution of lipids

The primary reason for the phospholipid bilayer's spontaneous formation is:

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