1. Which type of biological macromolecule is the main component of the plasma membrane? A. Lipid _2. A phospholipid has two parts. What are they called? A. Hydrophobic Head, Hydrophilic Tail C. Both B. Protein C. Carbohydrate D. Nucleic Acid of 4 B. Hydrophilic Head, Hydrophobic Tail D. None of the Above 3. Describes the arrangement the cell membrane as having parts that are not fixed in place and can move about. A. The Maze Model C. The Fluid Mosaic Model B. The Major Mobility Model D. The Crazy Cell Model 4. What three substances make up the cell membrane? A. Lipids, Fats, Sugars C. Lipids, Sugars, Proteins 5. What forms due to a difference in concentration of particles on opposite sides of the membrane? A. equilibrium 6. The principal force driving movement in diffusion is the A. Temperature 7. What problem is faced by organisms that lives in fresh water? B. Lipids, Proteins, Carbohydrates D. Lipids, Starches, Nucleic acids B. diffusion gradient C. concentration gradient D. concentration flow B. Particle Size C. Concentration Gradient D. Membrane Surface Area A. Their bodies tend to take in too much water B. They have no way of controlling their tonicity C. Only salt water poses problems for animals that live in it. D. Their bodies tend to lose too much water to their environment. 8. Which of the following substances requires a protein carrier in order to cross a membrane? A. Water Plasma membranes wear out B. Glucose Not all membranes are amphiphilic C. Sodium ion D. All of the above 9. How does the sodium-potassium pump make the interior of the cell negativity charged. A. By expelling anion C. By expelling more cations than are taken in B. By pulling in anion D. By taking in and expelling an equal number of cations 10. Which type of membrane carrier is responsible for the creation of Na+ and K+ gradients across the membrane of animal cells? A. A uniporter It leaves the cell B. A channel protein It is disassembled by the cell C. An antiporter t is used again in another exocytosis event. D. An ATP-powered pump G2 Phase 11. How does the cell membrane on the exterior of the cell differ from the membranes that envelope organelles inside the cell? A. Organelle membranes are not semipermeable B. Organelle membranes have a different signature of proteins floating in the bilayer. C. Organelle membranes are not composed of a phospholipid bilayer D. Organelle membranes aren't really membranes at all 12. The membrane itself is hydrophobic in the inner layers and doesn't allow water-soluble molecules to pass, yet water itself can permeate cells. Why? A. The membrane is fallible and sometimes water leaks through. B. Sometimes the membrane will mistake water molecules for lipids. C. Channels called aquaporins in the membrane allow water molecules to pass through freely. D. Water molecules cannot pass through the membrane.