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Micro-Mason
Microbiology - test 1
| Question | Answer |
|---|---|
| The presence of a glycocalyx would NOT be expected in | Fungi |
| Tumbles occur when | the flagella rotate clockwise |
| Which types of bacterial cells would have only a single flagellum? | monotrichous |
| Peritrichous bacteria make a run when | the flagella turn counterclockwise and become bundled |
| Which types of bacterial cells would have flagella located at only one end of the cell? | Lophotrichous and Monotrichous |
| What is significant of bacterial flagella? | flagella can rotate 360 degrees |
| Taxis is | movement towards or away from a stimulus |
| bacterium moving towards a light source is called? | positive phototaxis |
| As a bacterium approaches a food source, one would expect | runs to become more frequent |
| Why are receptors on the cell surface necessary for bacterial movement? | The receptors sense the stimulus and send signals to the flagella |
| How do axial filaments differ from regular bacterial flagella? | The axial filament is located between the cell membrane and the outer membrane. |
| What is the advantage to spirochetes of the corkscrew movement provided by axial filaments? | It allows the cells to move more easily through viscous human tissues and fluids, such as mucus. |
| Axial filaments are composed of | endoflagella |
| A bacterial cell possesses a glycocalyx. Which of the following is NOT true? | It will be engulfed more quickly by defensive cells of the host |
| Which of the following molecules is shared by both Gram-positive and Gram-negative organisms? | N-acetylmuramic acid |
| Amoxicillin is an antibiotic that inhibits the formation of peptide cross-links. Amoxicillin, therefore, would most likely inhibit the growth of | both Gram-positive and Gram-negative organisms |
| Porins are present in ______________bacteria because, in these organisms, molecules entering the cell must pass through an extra layer of ___________. | Gram-negative; membrane |
| A bacterial cell stains positive with the acid-fast stain. Which of the following is NOT true? | It has a cell wall that contains endotoxin. |
| Which of the following would NOT be expected to be present in a biochemical analysis of an archaeal cell? | peptidoglycan |
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