Word Bank: A. Oligosaccharide B. Hydrophobic ahelix C. Glycolipid D. Phospholipid E. Integral membrane protein F. Peripheral protein G. Cholesterol H. Glycoprotein 3. 4. 7. 5. 2. 6. 8. 1.

Consider the following diagram of the cell membrane. Which of the statements is NOT true regarding the cell membrane?   Group of answer choices a. Proteins and carbohydrates are also components of the cell membrane. b. Certain phospholipids and proteins on the outer surface of the cell membrane are attached to carbohydrates. c. Some carbohydrates extend through the entire lipid bilayer and appear on both surfaces of the membrane d. Some of the proteins embedded in the cell membrane constitute channels (passage canals).

Discuss the permeability of the phospholipid bilayer to the molecules and ions listed below. Is the bilayer freely permeable, somewhat permeable, or impermeable to each of these? 1. OH- 2. H* 3. 0₂ 4. C6H12O6 5. H₂O 6. CO₂ Which is not a major function of the protein in cell membranes? They are important for membrane transport They are important for cell-to-cell joining They function as enzymes They regulate membrane fluidity Which is not true about cell membranes? They frequently flip-flop from one side of the membrane to the other - They can move freely within one side of the bilayer Fatty acid tails of phospholipids form the membrane interior The interior of the bilayer is hydrophoic

For biological membranes, which of the following statement is NOT true? A. The phospholipid bilayer is a fluid matrix. B. Protein can be anchored to the membrane by covalently linked lipid chains. C. Proteins can move laterally across the membrane. D. For organisms living in cold temperature, their cell membranes contain more triacylglycerols. E. Transverse motion of lipid molecules can occur occasionally.   Enzyme lowers when... A. The energy difference between the substrate and the transition state B. The energy difference between the product and the transition state C. Both A and B D. Neither A nor B

Which of the following compounds can diffuse through the lipid bilayer of a cell membrane? Select all that apply.     A. Large polar molecules   B. Gases and hydrophobic molecules   C. Ions   D. Small polar molecules like water

The following are functions of lipids EXCEPT A. Isolate cellular components from its environment B. Serve as signal molecules and mediators of cellular processes C. Membrane fluidity determinant D. Alternative energy source of cells O E. Facilitate movement of metabolites in and out of cells

3) For each case given below, describe how the fluidity of membranes will change (increase or decrease) and why this change will happen. A. Increasing the number of double bonds (unsaturation) of the fatty acids in the phospholipids. B. Increasing the length of the fatty acid chains. C. Increasing the cholesterol content of the membrane D. Increasing temperature