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Essential Cell Biology

Biology

Quiz 11 :

Membrane Structure

Quiz 11 :

Membrane Structure

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Which of the following functions of the plasma membrane is possible without membrane proteins?
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Answer:

B

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Membrane synthesis in the cell requires the regulation of growth for both halves of the bilayer and the selective retention of certain types of lipids on one side or the other.Which group of enzymes accomplishes both of these tasks?
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Answer:

A

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Some lipases are able to cleave the covalent bonds between the glycerol backbone and the attached fatty acid.What final products do you expect to accumulate through the action of the enzyme monoacylglycerol lipase?
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Answer:

D

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New membrane phospholipids are synthesized by enzymes bound to the __________ side of the __________ membrane.
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A bacterium is suddenly expelled from a warm human intestine into the cold world outside.Which of the following adjustments might the bacterium make to maintain the same level of membrane fluidity?
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Cholesterol serves several essential functions in mammalian cells.Which of the following is NOT influenced by cholesterol?
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Membrane lipids are capable of many different types of movement.Which of these does not occur spontaneously in biological membranes?
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Which of the following membrane lipids does not contain a fatty acid tail?
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Which of the following would yield the most highly mobile phospholipid (listed as number of carbons and number of double bonds, respectively)?
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Membrane curvature is influenced by the differential lipid composition of the two membrane monolayers.Which factor do you think has the largest impact on the curvature of biological membranes?
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Where does most new membrane synthesis take place in a eukaryotic cell?
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Three phospholipids, X, Y, and Z, are distributed in the plasma membrane as indicated in Figure 11-10.For which of these phospholipids does a flippase probably exist? img Figure 11-10
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Membrane proteins, like membrane lipids, can move laterally by exchanging positions with other membrane components.Which type of membrane protein is expected to be the least mobile, based on their function?
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Most animal fats form a solid at room temperature, while plant fats remain liquid at room temperature.Which of the following is a feature of lipids in plant membranes that best explains this difference?
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Which of the following is most likely to occur after the lipid bilayer is pierced?
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Water molecules readily form hydrogen bonds with other polar molecules, and when they encounter nonpolar molecules they must form hydrogen-bonding networks with neighboring water molecules.Which of the following molecules will cause a "cage" of water to form?
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Which type of lipids are the most abundant in the plasma membrane?
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Formation of a lipid bilayer is energetically favorable.How does this arrangement result in higher entropy for the system, and thus make bilayer formation energetically favorable?
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Which of the following phospholipid precursors is the most hydrophobic?
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Which of the following statements is TRUE?
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