Except for O, which is large and charged and b. which is large and polar, all of the following molecules are difficult to get through a cell membrane. O c. Hydrophobic and small. Oddly shaped and ionic.
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Except for O, which is large and charged and b. which is large and polar, all of the following molecules are difficult to get through a cell membrane. O c. Hydrophobic and small. Oddly shaped and ionic.
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- According to the fluid mosaic model of cell membranes, which of the following is a true statement about membrane phospholipids? They frequently flip-flop from one side of the membrane to the other. They have hydrophilic tails in the interior of the membrane. They can move laterally along the plane of the membrane. They are free to depart from the membrane and dissolve in the surrounding solution.The figure below illustrates a portion of a cell membrane. X denotes a membrane-spanning protein channel. Illustration of a partial cell membrane Which of the following is most likely true about the structure of X X A The upper and lower ends of X are hydrophilic and its middle is hydrophobic. C D The upper and lower ends of X, as well as its middle, are all hydrophobic. The upper and lower ends of X are hydrophobic and its middle is hydrophilic. The upper and lower ends of X, as well as its middle, are all hydrophilic.Glycolipids in the plasma membrane are located at: 1.Inner leaflet of the plasma membrane 2.The outer leaflet of the plasma membrane 3.Evenly distributed in the inner and outer leaflets 4.It varies according to cell types
- 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 cellsBelow are listed molecules with different chemical characteristics. Knowing that all molecules will eventually diffuse across a phospholipid bilayer, select the list that most accurately predicts the relative rates of diffusion of these molecules (fastest to slowest) across a biological membrane. alanine, propanol, sodium, estrogen sodium, propanol, alanine, estrogen estrogen, propanol, sodium, alanine estrogen, propanol, alanine, sodiumFrom the following list, choose TWO molecules capable of freely diffusing across the plasma membrane (i.e. no transport protein needed). nucleic acid V small charged electrolyte carbohydrate V nonpolar lipid hydrophilic protein hydrophobic molecule
- Which of the following statement best describes the chemical composition of cytoplasmic membrane? Cytoplasmic membrane is bilayer of phospholipids embedded with proteins Cytoplasmic membrane is composed of two layers- one layer of phospholipids and one layer of proteins. Cytoplasmic membrane is bilayer of proteins embedded with phospholipidsBelow is the skeletal formula of a molecule typically found in cell membranes. What type of molecule is this and how can you tell? What are the functions of this type of molecule in the plasma membrane of a cell? CH3 CH₂) (CH₂) 16 CH3 KoThe cell membrane facing the extracellular fluid is lined by the following: O a No Charges Ob Positive Charges c. Negative Charges Od. A and B O e A and C
- Below is the skeletal formula of a molecule typically found in cell membranes. What type of molecule is this and how can you tell? What are the functions of this type of molecule in the plasma membrane of a cell? H HO CH3 CH3 C-H + H-C-H HWhich type of proteins facilitate the movement of molecules in active transport and facilitated diffusion? A Transport Proteins such as channel or transporter(carrier) proteins. B All highly hydrophobic amino acid side chains. Proteins do not facilitate the transport of molecules across the selectively permeable membrane. All proteins facilitate the transport of molecules across the selectively permeable membrane.Which of the following provides the most accurate description so far of a cell membrane? The cell membrane is composed of a pure lipid bilayer that is covered entirely by proteins. The cell membrane is composed purely of a lipid bilayer that formed from lipid molecules that have aggregated. The cell membrane is composed of a lipid bilayer with membrane proteins moving freely in the lipid bilayer. O The cell membrane is composed of globular proteins that are covered by the lipid bilayer.