Cell Structure and Function

Integral proteins are characterized by being:

• Loosely attached to the surface
• Floating freely in the cytoplasm
• Always on the outer side
• Partially or totally buried in the membrane

Membrane proteins that are loosely attached to the surface are called:

• Integral proteins
• Transmembrane proteins
• Glycoproteins
• Peripheral proteins

Which model represents the current understanding of the plasma membrane's structure?

• Unit membrane model
• Sandwich model
• Fluid mosaic model
• Static bilayer model

The primary reason for studying red blood cells (RBCs) in plasma membrane research is that they:

• Contain a large nucleus
• Have unique carbohydrates
• Lack a nucleus and most organelles
• Are the smallest human cells

Which of the following contributes to the selective permeability of the cell membrane?

• Only carbohydrates
• Only lipids
• Only cholesterol
• Lipid bilayer and membrane proteins