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1 | |
Which statement(s) is/are true? |
| | A) | Leeuwenhoek viewed little creatures and called them animalcules. |
| | B) | Hooke named the cell after the cubicles in a monastery. |
| | C) | Schleiden and Schwann stated theories about the cell being the fundamental units of life for plants and animals respectively. |
| | D) | All of the above. |
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2 | |
The fluid mosaic model states that |
| | A) | The cell membrane is a phospholipid bilayer with embedded proteins and that it is in constant motion. |
| | B) | Water is repelled from both surfaces of the cell membrane. |
| | C) | There is a liquid portion between the parts of the cell membrane that facilitates the passage of molecules through the membrane. |
| | D) | All of the above. |
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3 | |
Consider diffusion. When dynamic equilibrium is reached, |
| | A) | For reasons that are as yet undetermined, molecules no longer cross from one side of the membrane (or gradient) to the other. |
| | B) | Energy transfer ceases and so the molecules no longer cross the membrane (or gradient). |
| | C) | Molecules continue to move across the membrane (or gradient) but the net movement remains unchanged. |
| | D) | Molecules continue to move across the membrane (or gradient) and eventually the equilibrium is disrupted. |
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4 | |
The diffusion of water through a selectively permeable membrane is known as |
| | A) | Osmosis. |
| | B) | Crenation. |
| | C) | Plasmolysis. |
| | D) | Turgidity. |
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5 | |
A sac with a selectively permeable membrane filled with a 5% salt solution is placed in a beaker filled with a 10% salt solution. The fluid in the sac is __________ to the fluid in the beaker and eventually the sac will __________. |
| | A) | Hypertonic / shrivel up |
| | B) | Hypotonic / shrivel up |
| | C) | Hypertonic / burst |
| | D) | Hypotonic / burst |
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6 | |
In order for facilitated diffusion to occur, it is necessary to have |
| | A) | ATP and a carrier such as a carrier protein. |
| | B) | Kinetic energy and a carrier such as a carrier protein. |
| | C) | ATP, but a carrier such as a carrier protein is not required. |
| | D) | Kinetic energy, but a carrier such as a carrier protein is not required. |
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7 | |
In active transport, |
| | A) | Energy (such as is found in ATP) is required to move molecules against a gradient. |
| | B) | Molecules diffuse against a gradient. |
| | C) | Kinetic energy is required to move molecules against a gradient. |
| | D) | Either endocytosis or exocytosis will occur. |
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8 | |
The endoplasmic reticulum is responsible for |
| | A) | Increasing the surface area where chemical reactions can occur. |
| | B) | Transporting substances throughout the cell. |
| | C) | Metabolizing fat and degrading toxic substances. |
| | D) | All of the above. |
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9 | |
If a cell's ribosomes all became non-functional, the immediate result would be that that cell would no longer be able to |
| | A) | Digest incoming phagocytized particles. |
| | B) | Produce proteins. |
| | C) | Utilize its lysosomes and peroxisomes. |
| | D) | Repair its DNA. |
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10 | |
The mitochondrion and the chloroplast are alike in which of the following ways? |
| | A) | Both have internal membranes that are, for the sake of chemical reactions, almost identical. |
| | B) | Both are involved in the conversion of energy from one form to another. |
| | C) | Both have structural compartments known as grana and stroma. |
| | D) | All of the above. |
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11 | |
Microtubules, microfilaments, and intermediate filaments are parts of the |
| | A) | Cytoskeleton. |
| | B) | Centriole. |
| | C) | Centrosome. |
| | D) | Basal body. |
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12 | |
Which statement(s) is/are true about the cilia and flagella? |
| | A) | If they are long, they are flagella; if they are short, they are cilia. |
| | B) | They both have a "9 + 2 arrangement" of microtubules. |
| | C) | They are both involved in movement - either of the cell or of external particles. |
| | D) | All of the above. |
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13 | |
Cellular inclusions are |
| | A) | Essential to the survival of the cell. |
| | B) | Permanent sites for the storage of nutrients and wastes. |
| | C) | Collections of materials often lacking a well defined structure. |
| | D) | All of the above. |
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14 | |
Which statement(s) is/are true about the nucleus? |
| | A) | Chromatin and chromosomes are identical except in spatial arrangement. |
| | B) | The nucleolus is an alternative (or immature) nucleus. |
| | C) | The nucleoplasm is the part of the matrix that gives the nucleus its internal rigidity. |
| | D) | All of the above. |
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15 | |
A prokaryotic cell typically has __________ but does not have __________. |
| | A) | An extensive endoplasmic reticulum / a membrane bound nuclear area. |
| | B) | Ribosomes / a membrane bound nuclear area. |
| | C) | A membrane bound nuclear area / an extensive endoplasmic reticulum. |
| | D) | A membrane bound nuclear area / ribosomes. |
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16 | |
Long cellular organelles of movement are: |
| | A) | cilia. |
| | B) | microfilaments inside cell. |
| | C) | flagella. |
| | D) | endoplasmic reticulum. |
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17 | |
Structures which are not well defined within the cytoplasm are called: |
| | A) | microfilaments. |
| | B) | cytoplasmic inclusions. |
| | C) | protoplasm components. |
| | D) | pinocytic vesicles. |
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18 | |
Water diffuses into a cell by |
| | A) | active transport. |
| | B) | facilitated diffusion. |
| | C) | phagocytosis. |
| | D) | osmosis. |
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19 | |
The organelle composed primarily of DNA: |
| | A) | ribosome. |
| | B) | nucleoplasm. |
| | C) | nucleolus. |
| | D) | chromosome. |
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20 | |
In the phospholipid layer of a cell membrane the ________ ends of the phospholipids are on the outside. |
| | A) | hydrophobic |
| | B) | hydrophilic |
| | C) | hypertonic |
| | D) | hypotonic |
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21 | |
The diffusion gradient is the difference between |
| | A) | small and large particles. |
| | B) | soluble vs. insoluble. |
| | C) | high to low concentrations. |
| | D) | outside and inside a cell. |
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22 | |
A cell that is 97% water is placed in pure water. |
| | A) | The cell is now in a hypertonic environment. |
| | B) | Solute will diffuse out of the cell until a point of equilibrium is reached. |
| | C) | The cell will shrink. |
| | D) | Water will diffuse into the cell. |
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23 | |
Which of the following moves molecules from an area of low concentration to an area of high concentration? |
| | A) | osmosis |
| | B) | facilitated diffusion |
| | C) | active transport |
| | D) | all of the above |
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24 | |
White blood cells (leukocytes) engulf invading bacteria and viruses by |
| | A) | pinocytosis. |
| | B) | budding. |
| | C) | active transport. |
| | D) | phagocytosis. |
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25 | |
Which one of the following is NOT composed of membrane? |
| | A) | mitochondria |
| | B) | centrioles |
| | C) | chloroplasts |
| | D) | golgi bodies |
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26 | |
Hydrolytic enzymes and proteins called defensins move from the ____ into the vacuole to destroy the microorganisms. |
| | A) | ribosomes |
| | B) | peroxisomes |
| | C) | mitochondria |
| | D) | lysosomes |
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27 | |
Which of the following is not a component of a prokaryotic cell? |
| | A) | ribosomes |
| | B) | chloroplast |
| | C) | plasma membrane |
| | D) | chromatin |
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28 | |
The site of protein synthesis is the |
| | A) | ribosome. |
| | B) | golgi apparatus. |
| | C) | nucleus. |
| | D) | mitochondria. |
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29 | |
Protein molecules are required for |
| | A) | osmosis. |
| | B) | active transport and facilitated diffusion. |
| | C) | diffusion. |
| | D) | concentration gradients. |
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