Which of the following is NOT a function of the cell membrane? Acts as a protective layer false Forms spindle fibers true Controls and regulates entry and exit of materials false Acts as a protective layer and form spindle fibers false Single Which of the following pairs is CORRECT about Membrane Proteins? Peripheral proteins: Gate for molecule passage false Integral proteins: Supportive strength false Anchored proteins: Acts as an enzyme in a hydrolysis reaction true Glycoproteins: Tissue formation false Single The cell membrane also contains sterols such as cholesterol. Which is TRUE about this lipid? Cholesterol is a type of channel protein false Cholesterol prevents the cell membrane from freezing true Cholesterol has a hydrophobic head and a hydrophilic tail false Cholesterol makes the cell membrane fully permeable false Single If you look at the structure of the cell membrane, you can see that it is composed of a phospholipid bilayer. Which of the following statements is CORRECT about this part? A. It has a hydrophobic head and a hydrophilic tail false B. It has a hydrophobic tail and a hydrophilic head false C. It is composed of two layers of phospholipids false D. B and C false Single Why is the biological model used to explain the nature and function of cell membranes called fluid mosaic? The plasma membrane is a mosaic made up of several types of molecules false The plasma membrane is fluid due to its flexible nature false The plasma membrane is semi-permeable due to the chemical properties of its components false All of the above true Single Why should phospholipid tails be nonpolar? They are naturally attracted to water and allow the plasma membrane to interact with its molecules easily false They repel water molecules which contribute to the semi-permeability of the plasma membrane true They freeze water molecules and prevents the membrane from being fluid false They connect to the cytoskeleton to provide supportive strength to the cell false Single Why are glycolipids vital in the structure and function of the cell membrane? They regulate membrane fluidity false They maintain membrane stability true They contribute proteins for cell division false They act as receptors false Single Which of the following pairs is CORRECT about phospholipids? Saturated fatty acids: one double bond false Unsaturated fatty acids: one double bond true Saturated fatty acids: allows plasma membrane to crystallize false Unsaturated fatty acids: allows plasma membrane to crystallize false Single Phospholipids are known to be amphipathic. What does this mean? A. They have a hydrophobic head and a hydrophilic tail false B. They have a hydrophobic tail and a hydrophilic head false C. They are nonpolar false D. B and C false Single Sixty percent of a dry cell membrane is made up of these molecule Lipids false Carbohydrates false Proteins true DNA false Single