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- Cholesterol is an integral part of plasma membranes. Based on its structure, where is it found in the membrane? O within the tail bilayer O on the extracellular surface O embedded with the phospholipid heads O attached to the intracellular surfaceWhat makes phospholipids good at forming cellular membranes? ○ Regions of aliphatic and hydrophilic atoms causing an internalization of phosphorous making a bilayer O The polar and non-polar regions create an amphipathic bilayer of phospholipids Covalent and ionic bonds between glycerols create a tight seal around the cell O The three saturated fatty tails in phospholipids create a semi solid like structure that maintains a cell's shape O The four ring structure of cholesterol serves as a scaffold for making hormonesA phospholipid can be used to do all the following except O Increase the fluidity with the presence of unsaturated fatty acid tails. create a bi-layer membrane using amphipathic properties. form a micelle using a single layer and a hydrophobic core. O connect to a glycerol molecule to create a triacylglyceride.
- Which is a characteristic of the phospholipids in cell membranes? Select one: O Phospholipids in a membrane interact with other membrane molecules, in part, through covalent forces O Phospholipids in a membrane interact with other membrane molecules through non-covalent forces O Increasing the proportion of protein in a membrane increases the amount of membrane symmetry O Increasing the proportion of saturated fatty acids in a membrane increases membrane fluidity O A phospholipid molecule glows in the dark after exposure to visible lightWhich of the following descriptions is the best for a phospholipid? A polar lipid molecule that fully repels water through all its parts A lipid molecule that consists of two fatty acids, glycerol and a phosphate group and is amphipathic A polar lipid molecule that is made nonpolar by the addition of a phosphate group O A polar lipid molecule that fully interacts with water O A nonpolar lipid molecule that is made fully polar by the addition of a phosphate group so it can interact with waterThe diagram below illustrates the molecular structure of the cell membrane. The phospholipid bilayer of a cell membrane A B polar group с phosphate glycerol Which of the following is false about the way in which the cell membrane maintains its structure? D water water The different components of an individual phospholipid are held by covalent bonds. The attraction between the individual lipid tails inside the cell membrane is maintained by van der Waals forces. The attraction between the phosphate groups and the water molecules inside and out. side of the cell is maintained by hydrogen bonds. The bonds between the individual phospholipids that make up the cell membrane are connected by covalent bonds.
- One 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 bondsCholesterol is an integral part of plasma membranes. Based on its structure and characteristics, where is it found in the membrane? O on the extracellular surface Owithin the tail portion of the bilayer O attached to the intracellular surface O embedded with the phospholipid heads Previous Page Page 3 of 7Which of the following are proteins? O cholesterol O ion channels O phospholipids O glycolipids O none of the above
- Sphingolipids are considered as phospholipids if: O The polar head group contains a single sugar (carbohydrate) such as glucose All sphingolipids are phospholipids O The polar head group contains a phosphate group The polar head group contains a complex sugar (carbohydrate) containg sialic acidWhy might adding a strong reducing agent like Dithiothreitol (DTT) help denature an extracellular protein? O Disulfide bonds might be reduced that might be critical in stabilizing its structure O Disulfide bonds might be oxidized that might be critical in stabilizing its structure O Disulfide bonds formed inside the cytoplasm can be oxidized O Cysteines can be reduced to form stabilizing disulfide bondsDiscuss 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