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| 1 | |
Cell theory includes the principle that |
| | A) | cells are the smallest living things. Nothing smaller than a cell is considered alive. |
| | B) | all cells are surrounded by cell walls that protect them. |
| | C) | all organisms are made up of many cells arranged in specialized, functional groups. |
| | D) | all cells are made of smaller subunits called organelles. Nothing smaller than an organelle is considered alive. |
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| 2 | |
The plasma membrane |
| | A) | is a carbohydrate layer that surrounds groups of cells, called tissues, to protect them. |
| | B) | is a double lipid layer with proteins inserted in it, which surrounds every cell individually. |
| | C) | is a thin sheet of structural proteins that lines the inside of some body cavities. |
| | D) | is composed of blood plasma that has solidified into a protective barrier. |
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| 3 | |
Organisms that have cells with a relatively uniform cytoplasm and no organelles are called ______________, and organisms whose cells have organelles and a nucleus are called ______________. |
| | A) | cellulose, nuclear |
| | B) | flagellated, streptococcal |
| | C) | eukaryotes, prokaryotes |
| | D) | prokaryotes, eukaryotes |
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| 4 | |
Within the nucleus of a cell you can find |
| | A) | a nucleolus. |
| | B) | many ribosomes. |
| | C) | a cytoskeleton. |
| | D) | all of the above. |
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| 5 | |
The endomembrane system within a cell includes |
| | A) | the cytoskeleton and the ribosomes. |
| | B) | the prokaryotes and the eukaryotes. |
| | C) | the endoplasmic reticulum and the Golgi complex. |
| | D) | the mitochondria and the chloroplasts. |
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| 6 | |
Until fairly recently it was thought that only the nucleus of each cell contained DNA. We now know that DNA is also carried in the |
| | A) | cytoskeleton and the ribosomes. |
| | B) | the prokaryotes and the eukaryotes. |
| | C) | the endoplasmic reticulum and the Golgi bodies. |
| | D) | the mitochondria and the chloroplasts. |
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| 7 | |
Which of the following statements is true? |
| | A) | All cells have a cell wall for protection and structure. |
| | B) | Eukaryotic cells in plants and fungi, and all prokaryotes, have a cell wall. |
| | C) | There is a second membrane composed of structural carbohydrates surrounding all cells. |
| | D) | Prokaryotes and all cells of eukaryotic animals have a cell wall. |
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| 8 | |
If you put a drop of food coloring into a glass of water, the drop of color will |
| | A) | fall to the bottom of the glass and sit there unless you stir the water; this is because of hydrogen bonds. |
| | B) | float on the top of the water, like oil, unless you stir the water; this is because of surface tension. |
| | C) | instantly disperse throughout the water; this is because of osmosis. |
| | D) | slowly disperse throughout the water; this is because of diffusion. |
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| 9 | |
When large molecules such as food particles need to get into a cell, they cannot easily pass through the plasma membrane and so they move across the membrane through the processes of |
| | A) | diffusion and osmosis. |
| | B) | endocytosis and phagocytosis. |
| | C) | exocytosis and pinocytosis. |
| | D) | permeability and reception. |
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| 10 | |
Active transport of certain molecules involves |
| | A) | diffusion and osmosis. |
| | B) | endocytosis and phagocytosis. |
| | C) | energy and specialized pumps or channels. |
| | D) | permeability and reception. |
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