quiz 7 - Quiz #7 Name: _ 1) A helix is said to be...

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Quiz #7 Name: ______________________________ 1) A helix is said to be amphipathic if a. there is a proline in the middle of the sequence that causes it to bend at an angle. b. the helix is composed predominantly of hydrophobic residues. c. one side is hydrophobic and the other is ionic/hydrophilic. d. the helix is on the exterior of the protein. 2) The figure below shows the schematic structure of a phospholipid molecule. The letters A, B, C, D indicate specific components of the structure. Which of these components would differ if you compared the structure of phosphotidyl choline versus phosphotidyl ethanolamine . a. A b. B c. C d. D 3) Suppose you are investigating the transport of the amino acid tryptophan by muscle cells. You observe that there is a net uptake (flux) of tryptophan into the cell when the plasma (extracellular) concentration is 1 mM and the intracellular concentration is 10 mM. Which one of the following is the best guess of the classification of this transport system? a. Simple passive diffusion through the lipid bilayer. b. Transport using a passive (facilitated) carrier protein transport system. c. Transport using a protein system that couples the transport of tryptophan with some other solute.
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d. Protein transport system that directly couples the transport of tryptophan to ATP hydrolysis. 4) Which of the following statements is FALSE? a. Plasma membranes are made up of a double layer of lipid molecules in which proteins are embedded. b. The plasma membrane includes phospholipids and cholesterol. c. The plasma membrane has both integral proteins and peripheral membrane proteins. d. The plasma membrane has RNA binding sites on the inside surface that resemble rough endoplasmic reticulum. 5) Lipid bilayers are very delicate structures, yet cell membranes are highly resistant to mechanical stress. What is primarily responsible for the mechanical toughness of the plasma membrane? a. Phospholipid head groups b. The underlying cytoskeletal cortex c. Cholesterol d. Hydrostatic pressure e. Transmembrane proteins 6) From text – (Fluorescence recovery after photobleaching, FRAP, is a technique used to study membrane dynamics by tracking the movement of proteins within the plasma
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quiz 7 - Quiz #7 Name: _ 1) A helix is said to be...

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