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1 | |
The diploid state of a microorganism refers to the times when cells contain _______ copy (ies) of each chromosome and occurs after mitotic cell division. |
| | A) | one |
| | B) | two |
| | C) | three |
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2 | |
The mitochondria is the site of |
| | A) | protein synthesis |
| | B) | lipid synthesis |
| | C) | energy production |
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3 | |
The cytoplasmic matrix is best described as |
| | A) | A dilute aqueous solution that fills most of the cell. |
| | B) | A solution of inorganic salts intended to balance osmotic pressure in the cell. |
| | C) | A semicrystalline mixture mostly of proteins and bound water molecules. |
| | D) | Material in transit between membrane bound organelles. |
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4 | |
Which of the following statements about Endoplasmic reticulum (ER) is not true? |
| | A) | ER can transport proteins and lipids to the plasma membrane or for secretion. |
| | B) | ER is the main site for cell membrane biosynthesis. |
| | C) | ER is contiguous with the nuclear membrane. |
| | D) | ER is the main site for synthesis of cytoplasmic proteins. |
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5 | |
When Listeria monocytogenes invades a eucaryotic cell, it secretes the ActA protein that |
| | A) | polymerizes actin filaments, causing the bacterium to move through the cytoplasm. |
| | B) | depolymerizes microfilaments, allowing the bacterium to move more easily in the cytoplasm. |
| | C) | degrades the cytoskeleton, allowing the bacterium to travel through the plasma membrane to adjacent cells. |
| | D) | attaches to microtubules, allowing the bacterium to move along the fibers. |
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6 | |
Colchicine treatment of cells to disrupt microtubules can result in |
| | A) | loss of cell shape |
| | B) | loss of directional movement. |
| | C) | loss of nutrient transport. |
| | D) | all of the above. |
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7 | |
Which of the following is NOT a mechanism for a cell to degrade its own cytosolic proteins? |
| | A) | Autophagic vacuoles |
| | B) | Phagocytosis and secondary lysosome fusion. |
| | C) | 26S Proteosome degradation. |
| | D) | All the above are correct mechanisms. |
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8 | |
Lysosomes of the cell are where |
| | A) | lysozyme is synthesized. |
| | B) | secretory proteins are transported to the surface. |
| | C) | endocytosed material is degraded. |
| | D) | glycogen is stored as an energy source. |
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9 | |
Mitochondria are similar to bacteria in several ways. Which of the following is NOT a similarity? |
| | A) | Both have peptidyl glycan in their cell wall. |
| | B) | Both have circular, double stranded DNA. |
| | C) | Both are about the same size. |
| | D) | Both have 70S ribosomes. |
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10 | |
The F1 particles of mitochondria are |
| | A) | a type of ribosome that synthesizes mitochondrial proteins. |
| | B) | a structural component of the mitochondrial inner membrane. |
| | C) | an enzyme complex that synthesizes ATP during respiration. |
| | D) | a storage complex for calcium phosphate in the mitochondria. |
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11 | |
Plastids are |
| | A) | protrusions of plasma membrane that bud off of plant cells. |
| | B) | cytoplasmic organelles that often contain photosynthetic pigments. |
| | C) | pieces of circular, double stranded DNA that can carry drug resistance. |
| | D) | areas of the nucleus where rRNA is transcribed. |
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12 | |
The light reaction of photosynthesis is where |
| | A) | carbohydrates are formed from CO2 and water. |
| | B) | polysaccharides are formed in the pyrenoid. |
| | C) | proteins within the stroma are made to give off photons of light. |
| | D) | photons from light are trapped to generate ATP and O2. |
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13 | |
The nucleus of the cell is where |
| | A) | energy for cell division is generated. |
| | B) | ribosomes translate mRNA into proteins. |
| | C) | chromatin is kept within a membrane delimited body. |
| | D) | endocytic vacuoles fuse with lysosomes. |
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14 | |
The nuclear pores are passageways between the nuclear matrix and the cytoplasm which |
| | A) | allow DNA to reach the cytoplasm to be translated to RNA. |
| | B) | allow ribosomes to enter the nuclear matrix. |
| | C) | allow proteins synthesized in the cytoplasm to enter the nucleus. |
| | D) | structurally reinforce the nuclear membrane. |
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15 | |
DNA is the primary molecule for information storage in |
| | A) | procaryotes only. |
| | B) | eucaryotes only. |
| | C) | both procaryotes and eucaryotes. |
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16 | |
Cell walls, when they exist, usually contain peptidoglycan in |
| | A) | procaryotes only. |
| | B) | eucaryotes only. |
| | C) | both procaryotes and eucaryotes. |
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17 | |
When flagella exist, their movement is powered by ATP in |
| | A) | procaryotes only. |
| | B) | eucaryotes only. |
| | C) | both procaryotes and eucaryotes. |
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18 | |
Membrane bound organelles such as mitochondria and Golgi are found in |
| | A) | procaryotes only. |
| | B) | eucaryotes only. |
| | C) | both procaryotes and eucaryotes. |
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19 | |
Ribosomes are required for synthesis of proteins in |
| | A) | procaryotes only. |
| | B) | eucaryotes only. |
| | C) | both procaryotes and eucaryotes. |
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20 | |
Exoenzymes are contained in the periplasmic space in |
| | A) | procaryotes only. |
| | B) | eucaryotes only. |
| | C) | both procaryotes and eucaryotes. |
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21 | |
All the cells chromosomes are contained in the cell nucleus for |
| | A) | procaryotes only. |
| | B) | eucaryotes only. |
| | C) | both procaryotes and eucaryotes. |
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2002 McGraw-Hill Higher Education