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Biological Membranes.docx

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Department
Biochemistry
Course
BIOCH200
Professor
Nat Kavetal
Semester
Fall

Description
Biological Membranes 1. Which of the following statements about passive and primary active transport proteins is FALSE? A. They are both integral membrane proteins. B. They both show a high degree of selectivity. C. Both require a concentration gradient to function. D. They both change conformation during transport. 2. Which one of the following statements is TRUE for passive transport across a biological membrane? A. Passive transport is driven by a solute concentration gradient. B. Passive transport is driven by ATP. C. Passive transport is endergonic. D. Passive transport is irreversible. E. Passive transport is not specific with respect to the substrate. 3. Which of the following determines the force that "drives" an ion through an ion channel in a membrane? A. The size of the concentration gradient across the membrane. B. The size and shape of the channel. C. The size of the ion. D. The properties of the selectivity filter. 4. Which of the following statements about biological membranes is TRUE? A. Integral membrane proteins penetrate or span the lipid bilayer, interacting with the hydrophobic lipid acyl chains. B. The composition of membrane lipid bilayers may be varied slightly, to maintain it in the gel‐crystalline state. C. The bilayer is stabilized by hydrophobic interactions between the polar lipid head groups and the aqueous environment. D. Peripheral membrane proteins are covalently bound with the polar lipid head groups of the bilayer. 5. Which of the following is never found in biological membranes? A. Glycerophospholipids B. Cholesterol C. Sphingolipids D. Triacylglycerols E. Sphingolipids and Triacylglycerols 6. A transporter protein moves substances X and Y as shown in the following diagram. It moves X down its concentration gradient and Y up its concentration gradient. What type of transport is this? A. Primary active antiport. B. Primary active symport. C. Secondary active antiport. D. Secondary active symport. + 7. The following are steps which incompletely describe the mechanism by which Na and K ions are transported by the Na K ATPase. What is the correct sequence for the events listed, assuming that Na+ ions have just dissociated? 1. The phosphate group on the protein is hydrolyzed. 2. ATP binds to the protein. 3. The protein's conformation changes, exposing K binding sites to the cell interior. + 4. Na ions bind. A. 1, 3, 2, 4 B. 1, 3, 4, 2 C. 4, 2, 3, 1 D. 4, 2, 1, 3 8. Why are glycerophospholipids capable of spontaneously assembling into the bilayer structure found in biological membranes? A. Glycerophospholipids are amphipathic. B. Glycerophospholipids have two acyl chains that align easily side‐by‐side to form a bilayer. C. Fatty acids are weakly amphipathic. D. Glycerophospholipids are amphipathic. Secondly, glycerophospholipids have two acyl chains that align easily side‐by‐side to form a bilayer. E. All of the statements are true. 9. Which of the following statements most accurately defines the term “symport.”? A. A protein which transports two substances in the same direction. B. A protein which transports two substances in opposite directions. C. A protein which transports two substances in the same direction up their concentration gradients. D. A protein which transports two substances in opposite directions up their concentration gradients. 10.Transport of digested glucose across intestinal cells from the intestinal space to the blood requires multiple transp
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