Cell Structure and Function

Who proposed the fluid mosaic model of the cell membrane?

• Watson and Crick
• Schleiden and Schwann
• Robertson and Hooke
• Singer and Nicolson

Which of the following is a key function of peripheral proteins?

• Forming ion channels
• Spanning the membrane
• Signal transduction and enzyme activity
• Storing genetic information

Which of the following is NOT a function of membrane proteins?

• Transport of molecules
• Signal transduction
• Enzymatic reactions
• DNA synthesis

The process by which phospholipids arrange themselves in water is called:

• Diffusion
• Osmosis
• Active transport
• Self-assembly

Which of the following best describes the orientation of phospholipids in a bilayer?

• Heads inward, tails outward
• Random orientation
• Heads face outward, tails inward
• Only one layer exists