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Biological Science Study Set 3

Biology

Quiz 6 :

Lipids, Membranes, and the First Cells

Quiz 6 :

Lipids, Membranes, and the First Cells

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What most distinguishes lipids from other biomolecules is
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B

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Cooking oil and gasoline a hydrocarbon) are not amphipathic molecules. Why?
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B

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You want to view the surface of a particular cell or tissue group of related cells) at magnifications above 1000x. What tool would you use?
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D

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Which of the following increases the strength of the hydrophobic interactions in lipid bilayers and thus makes them less permeable to polar molecules?
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In marshes and other wet areas where vegetation is rotting, the water surface often has an oily sheen due to insoluble compounds. What are these molecules?
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Steroids are
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The term phospholipid can best be described by which of the following?
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Which of the following is the best explanation for why vegetable oil is a liquid at room temperature, while animal fats are solid?
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What do phospholipids and triglycerides have in common?
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Phospholipid bilayer membranes are selectively permeable. What does that mean?
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If you mechanically shook a mixture of amphipathic lipids and water, what would you expect to see when the solution is observed with an electron microscope?
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What type of functional group results when the alcohol group on glycerol reacts with the carboxylic acid group on a fatty acid?
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Phospholipids can form all of the following structures in water EXCEPT which one?
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Which of the following substances would most likely require a protein to facilitate its diffusion across a cell membrane?
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Which of the following is the best explanation for why cholesterol decreases the permeability of biological membranes?
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In an experiment involving planar bilayers, a solution of table salt sodium and chloride ions in water) is added on the left side of the membrane, while pure water is added on the right side. After 30 minutes, the researchers test for the presence of ions on each side of the membrane. The right side tests negative for ions. What can you conclude?
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Which of the following phospholipid membranes would be most permeable to glycerol?
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Which aspect of phospholipids is most important to the formation of bilayers?
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What region of a steroid is hydrophilic?
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Which characteristic would be expected in the plasma membranes of a plant that can survive winters in Northern Ontario, compared to a plant growing in a warmer region?
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