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15 Cards in this Set
- Front
- Back
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In osmosis, water diffuses from the side of the membrane with a higher concentration of water to the side with a lower concentration of water. What determines the concentration of water in a solution?
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the amount of molecules other than water dissolved in the solution
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The plasma membrane of the cell _____.
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is permeable to water
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Many metabolic poisons work by inhibiting ATP production. Which type of transport would be most affected?
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active transport
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Two types of connections between cells, called gap junctions and plasmodesmata, are specialized to _____.
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permit the passage of substances (e.g., ions) between cells through small passageways that directly link the cytoplasm of one cell to the cytoplasm of another cell
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Which of the following characteristics can be used to describe cell walls
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A. porous
B. strong C. composed of cellulose or polysaccharides |
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A cell is placed in a hypotonic solution. What will happen?
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Water will move into the cell.
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What is the difference between active transport and passive transport?
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Active transport requires energy and can move substances against their concentration gradient. Passive transport does not require energy and can move substances only down their concentration gradient.
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Which cell junctions function to make the connections between cells leakproof
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tight junctions
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Substances are able to cross the lipid bilayer of a cell at different rates that are unique for each substance. Which of the following characteristics would favor the simple diffusion of a substance across a cell membrane?
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small molecule size
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Due to a high percentage of unsaturated fatty acids in their membrane, certain microorganisms _____
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are able to withstand low temperatures because their membranes do not solidify as rapidly
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Which of the following associations is not correct?
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desmosomes-- allow inflexible attachments among cells
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If there is a high concentration of oxygen on one side of a biological membrane, what will happen
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The oxygen will diffuse across the membrane until the concentration of oxygen on each side is the same.
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When placed in a certain sucrose solution, the volume of a cell decreases; therefore, the sucrose solution is _____ to the cell contents.
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hypertonic
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The point at which a substance is evenly dispersed within a fluid _____.
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is referred to as a dynamic equilibrium and happens when net diffusion is zero
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Diffusion is the movement of molecules from _____.
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an area of higher concentration of that type of molecule to an area of lower concentration
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