Choose the one answer that best answers the question.
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1 | |
Basically, cell membranes are ___. |
| | A) | phospholipid bilayers |
| | B) | hydrophilic |
| | C) | hydrophobic |
| | D) | tonoplasts |
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2 | |
The phosphate group of the cell membrane is polar and therefore is ____. |
| | A) | phospholipid |
| | B) | hydrophobic |
| | C) | hydrophilic |
| | D) | amphipathic |
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3 | |
Which part of the phospholipid is hydrophobic? |
| | A) | the phosphate group |
| | B) | the polar region |
| | C) | the fatty acid |
| | D) | the glycerol |
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4 | |
Which of the following is not a part of the fluid mosaic model? |
| | A) | carbohydrates |
| | B) | phospholipids |
| | C) | proteins |
| | D) | starch |
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5 | |
Molecules that are ___ can pass through the cellular membrane. |
| | A) | large |
| | B) | hydrophobic |
| | C) | ionic |
| | D) | hydrophilic |
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6 | |
During the two procedures from lab, what was the indicator that cell membranes were damaged? |
| | A) | Betacyanin leaked from the tonoplast and the plasma membrane, turning the water red. |
| | B) | Betacyanin was absorbed from the water turning the tonoplasts red. |
| | C) | Tonoplasts were produced. |
| | D) | The cell membrane pulled away from the cell wall. |
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7 | |
Basically, how do extreme temperatures affect cellular membranes? |
| | A) | Cold temperatures crystalize membranes, making them stronger. |
| | B) | High temperatures cause violent molecular collisions that destroy the membrane. |
| | C) | Cold temperatures crystalize the membranes, causing them to break down. |
| | D) | None of the above. |
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8 | |
Basically, how do organic solvents affect cellular membranes? |
| | A) | Organic solvents add lipids to the lipid bilayer, making it stronger. |
| | B) | Organic solvents remove lipids from the lipid bilayer, making it too small to hold the cytoplasm. |
| | C) | Organic solvents dissolved the lipids in the lipid bilayer, destroying the membrane. |
| | D) | Organic solvents crystalize the water, which destroys the membrane. |
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9 | |
When studying the results of your experiments with a spectrophotometer, why do you think it was necessary to set the wavelength to 460nm? |
| | A) | This is the wavelength of least absorbance. |
| | B) | This is the wavelength of greatest absorbance. |
| | C) | This is the lowest wavelength a spectrophotometer can measure. |
| | D) | This would cancel out the affects of the water in the sample. |
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10 | |
Membrane permeability depends on which factors? |
| | A) | chemical composition of the membrane |
| | B) | the amount of proteins in the membrane |
| | C) | the size and solubility of the molecules trying to enter the membrane |
| | D) | the amount of betacyanin in the membrane |
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2002 McGraw-Hill Higher Education