Which of the following characteristics is true for the inner section of a membrane? O hydrophilic O contains water O polar O hydrophobic Which of the following is NOT a primary function of lipids? O signalling / hormones / inflammation O storing certain vitamins O production of enzymes O formation of membrane structure
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- All the following is a function of membrane proteins EXCEPT: Cell-cell contact O Protein synthesis Transporting substances cross the membrane O Enzymatic activity which of the following sentences are INCORRECT: All living things are composed of one cells all cells have the same size The cell is the basic structural, O functional, and biological unit of all organisms Robert Hook discovered the cellsWhich of the following statements about lipids in membranes is FALSE? O Membrane curvature may be controlled by the size of head groups in lipids O Lipids can move laterally within a membrane leaflet O Liposomes are synthesized membrane structures used to study membranes in the laboratory Flexion is when the hydrophobic tails of lipids swing and cross each other O Lipids flip-flop from the inner leaflet to the outer leaflet spontaneouslyWhich of the following components of the cell membrane is found exclusively in the inner layer of the lipid bilayer? Ocholesterol O glycolipids O charged phospholipids O channels O receptors
- The extracellular matrix is NOT composed of? OActin O Collagens Fibronectin O Proteoglycans O None of theseWhich of these can never cross the lipid bilayer without the help of a transporter or a channel? O CO2 O 02 O water O Na+ O all of the above can diffuse through the lipid bilayer without transporter proteins or channelsWhich of the following components of the cell membrane is found exclusively in the outer layer of the lipid bilayer? O cholesterol O glycolipids O charged phospholipids O anchor proteins O enzymic proteins
- A biochemist performed a subcellular fractionion ( a separation of cell organelles) and them run TLC to measure the relative presense of defererent lipids. In one fraction there was an absence of cholesterol. What fraction was it? O plasma membrane O cytoplasm O lysosome mitochondria O nucleusThe role of proteins in a cell include the following (choose all that apply) identifying self and distinguishing it from an invading organism none of the answers is correct O making up the phospholipid bilayer O transporter molecules embedded in the cell membrane O a means of locomotionAt temperatures that are much lower than a lipid bilayer's melting point, adding cholesterol will most likely the fluidity of the bilayer. O increase O maintain O decrease
- What chemical property characterizes the interior of the phospholipid bilayer? O hydrophilic O hydrophobic saturated O polarOne of the following is correct regarding the biological membranes O Proteins are linked to phospholipids with covalent interactions O It doesn't contain is any kind of symmetry O Cholesterol increases the fluidity of the membrane O Phospholipid molecules are linked together with covalent bondsThe cell membrane facing the intracellular fluid is lined by the following: O a. No Charges Ob Positive Charges OC. Negative Charges Od A and B Oe. A and C