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| 1 | |
The plasma membrane is composed primarily of _____. |
| | A) | phospholipids |
| | B) | carbohydrates |
| | C) | waxes |
| | D) | nucleic acids |
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| 2 | |
The tails of the phospholipids are _____. |
| | A) | nonpolar |
| | B) | hydrophobic |
| | C) | directed inwards in the bilayer |
| | D) | All of these |
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| 3 | |
The permeability of most membranes is reduced by the presence of _____ in the membrane. |
| | A) | nucleotides |
| | B) | proteins |
| | C) | cholesterol |
| | D) | glycolipids |
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| 4 | |
Particular molecules or ions freely cross the plasma membrane with assistance from _____. |
| | A) | receptor proteins |
| | B) | cell recognition proteins |
| | C) | channel proteins |
| | D) | enzymatic proteins |
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| 5 | |
A person's blood type is determined by the presence of particular _____ in the red blood cells' membranes. |
| | A) | phospholipids |
| | B) | glycoproteins |
| | C) | steroids |
| | D) | nucleic acids |
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| 6 | |
Which of the following does NOT move freely (without energy or a carrier protein) across the plasma membrane? |
| | A) | H2O |
| | B) | Steroids |
| | C) | Na+ |
| | D) | O2 |
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| 7 | |
Osmosis is specifically about the movement of _____ in and out of cells. |
| | A) | sugars |
| | B) | proteins |
| | C) | water |
| | D) | oxygen |
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| 8 | |
If the inside of a cell is 1% NaCl, which solution is isotonic to the cell? |
| | A) | 0.01% NaCl |
| | B) | 0.1% NaCl |
| | C) | 1% NaCl |
| | D) | 10% NaCl |
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| 9 | |
When a plant cell is placed in a hypotonic solution which of the following will occur? |
| | A) | The cell will swell and burst. |
| | B) | Nothing will occur. |
| | C) | The central vacuole gains water. |
| | D) | The cell will shrink or shrivel up. |
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| 10 | |
The term hemolysis refers to ______. |
| | A) | normal red blood cells |
| | B) | red blood cells that burst after being placed in a hypotonic solution |
| | C) | shrinking of the cytoplasm after a cell is placed in a hypertonic solution |
| | D) | the loss of turgor pressure in a plant cell |
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| 11 | |
Which of the following correctly describes facilitated transport? |
| | A) | It requires the expenditure of energy. |
| | B) | Molecules move from high concentration to low concentration. |
| | C) | Vacuoles form to move materials. |
| | D) | All of the above. |
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| 12 | |
Insulin leaves insulin-secreting cells by _____. |
| | A) | phagocytosis |
| | B) | receptor-mediated endocytosis |
| | C) | osmosis |
| | D) | exocytosis |
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| 13 | |
The peptide hormone, follicle stimulating hormone, would activate its specific target cells by _____. |
| | A) | diffusing into the cells |
| | B) | binding a receptor protein in the plasma membranes |
| | C) | phagocytosis |
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| 14 | |
Heart cells are able to contract in unison because of the flow of ions through _____. |
| | A) | gap junctions |
| | B) | tight junctions |
| | C) | adhesion junctions |
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| 15 | |
People may get injections of _____, a component of the extracellular matrix of animal cells, to get rid of their wrinkles. |
| | A) | collagen |
| | B) | cholesterol |
| | C) | cellulose |
| | D) | chromatin |
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| 16 | |
Which of the following correctly describes active transport? |
| | A) | Carrier proteins are needed. |
| | B) | It requires the expenditure of energy. |
| | C) | Molecules move from areas of low concentration to areas of high concentration. |
| | D) | All of these. |
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| 17 | |
Macrophages, immune system cells, engulf bacteria by _____. |
| | A) | exocytosis |
| | B) | facilitated transport |
| | C) | phagocytosis |
| | D) | osmosis |
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| 18 | |
The amount of phospholipid extracted from red blood cells led researchers to propose that ____. |
| | A) | the phospholipids form a single layer around the cell |
| | B) | the phospholipids form a bilayer around the cell |
| | C) | there are not enough phospholipids to create a membrane around the cell |
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| 19 | |
According to the fluid-mosaic model, _____ are partially or wholly embedded in a fluid phospholipid bilayer. |
| | A) | nucleic acids |
| | B) | monosaccharides |
| | C) | proteins |
| | D) | triglycerides |
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| 20 | |
Transplant rejections are the result of the immune system's response to foreign ______ and __________. |
| | A) | DNA, RNA |
| | B) | glycoproteins, glycolipids |
| | C) | plasma membranes; glycolipids |
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