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- 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 hydrophoicWhich of the following is a true statement? Sphingolipids contain 2 hydrophobic, acyl chains Phospholipids contain 3 hydrophobic acyl chains Sphingolipids are completely no-polar, hydrophobic molecules The different types of phospholipids do not have different physical properties when in the membraneMolecule 1 Molecule 2 Molecule 3 Molecule 4 contain amino and carboxyl group D monosaccharides contain sugar phosphate and nitrogen base monomerS example glucose steroid hereditary information cell support, transport, movement uses energy storage Which of the following correctly completes the table? O A=DNA or RNA, B=cell fuel and support, C=galactose and glycogen, D=nucleic acids and fatty acids OA=DNA or RNA, B=cell fuel and support, C=fatty acids and glycerol , D=hemoglobin and actin O A-fructose and lipids, B =cell control and fuel, C=enzyme and catalyst, D=nucleotides and myosin O A=hemoglobin and insulin, B=cell control and reproduction, C=deoxyribose and ribose, D=sugars and lipids
- Which 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 receptorsWhat is the role of cholesterol in the cell membrane? It converts cis bonds of fatty acids to trans. It allows for the formation of micelle structures. It attracts to the polar phospholipid heads. It reduces membrane fluidity.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 light
- Which 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 statements is true of phospholipid bilayers? O The surfaces are covered by the hydrophobic tails O They spontaneously form in water O Covalent bonds lock the molecules together into the bilayer O They are considered secondary structures of phospholipidsWhat 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 hormones
- Kate and Lisa discuss the phospholipid cell membrane. What causes the phospholipid molecules to orient themselves the way they do in the bilayer? O Enzymes arrange the phospholipid molecules in a bilayer to maximize their energy. O The polar phospholipid tails interact with water while the nonpolar phospholipid heads avoid water. O It follows the "like repels like" rule. The polar phospholipid heads interact with water while the nonpolar phospholipid tails avoid water. O The entire phospholipid molecule is nonpolar and avoids water. O The entire phospholipid molecule is hydrophilic.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 bondsthe lipid bilayer of a plasma membrane most ranh A) hydrocarbons. B) amino acid. Oose the most correct answer (5 8. Which of the following would likely move through 1.Celi membrane is composed of a bilayer of: 1.Cell membrane is composed of a bilayer or: A) Phospholipids. 9. Which of the following contains hydrolytic enzymes? the lipid bilayer of a plasma membrane most rapidly? B) Steroids. C) Fatty acids. C) Glucose. D) K+. 9. Which of the following contains hydrolytic enzymera A) Lysosome. B) Endoplasmic reticulum C) Mitochondrion. D) Golgi apparatus. D) Triglycerides. 2. All of the following contain amino acids except A) hemoglobin. B) cholesterol. C) antibodies. D) enzymes. 3. What is the chemical reaction mechanism by which cells make polymers from monomers? A) phosphodiester linkages. B) hydrolysis. C) dehydration reactions. D) ionic bonding of monomers T 10. Which one of the following is/are a function of celI membrane proteins? A) Enzymatic activity. B) Signal transduction. C)…