University of Houston MICRO 3332 Quiz 2 1)Which would NOT be one that could be involved in the movement and orientation of an aquatic bacterial species to an optimum depth in a freshwater or marine environment? Magnetosomes Gas vacuoles Flagella/flagellum Metachromatic granules A-D all applicable FtsZ protein, MreB protein, and CreS (crescentin) protein are associated with The bacterial cytoskeleton Peptidoglycan Bacterial flagella Bacterial shape/form and cell division 2 of the above are correct If you prepared a liquid (aqueous) growth media containing only mineral salts, trace elements, and an energy source such as reduced iron or hydrogen gas, you would be selecting for: Chemoheterotrophs Photoautotrophs Chemolithotrophs Photoheterotrophs If you were preparing a defined, minimal medium for an aerobic, heterotrophic bacterium to grown on, which of the following constituents would have to be substituted in order to supply a proper carbon and energy source for this bacterium? NaCO3 NH4SO4 K2HPO4/KH2PO4 Fe2+ and MgCl2 None of the above would have to be substituted A strictly differential growth medium is one that Would be a good choice to isolate Gram-negative bacteria from a mixed culture containing both Gram-positive and Gram-negative bacteria, respectively Can yield varying color reactions depending upon the metabolic capabilities of the bacteria growing on it Contains agents in order to inhibit the growth of certain bacterial types A, B, and C are all correct   A cross-section of the cell envelope of two bacterial cells, A and B, are shown in the figure

University of Houston

MICRO 3332

Quiz 2

1)Which would NOT be one that could be involved in the movement and orientation of an aquatic bacterial species to an optimum depth in a freshwater or marine environment?

1. 1. Magnetosomes
   2. Gas vacuoles
   3. Flagella/flagellum
   4. Metachromatic granules
   5. A-D all applicable
2. FtsZ protein, MreB protein, and CreS (crescentin) protein are associated with
   1. The bacterial cytoskeleton
   2. Peptidoglycan
   3. Bacterial flagella
   4. Bacterial shape/form and cell division
   5. 2 of the above are correct
3. If you prepared a liquid (aqueous) growth media containing only mineral salts, trace elements, and an energy source such as reduced iron or hydrogen gas, you would be selecting for:
   1. Chemoheterotrophs
   2. Photoautotrophs
   3. Chemolithotrophs
   4. Photoheterotrophs
4. If you were preparing a defined, minimal medium for an aerobic, heterotrophic bacterium to grown on, which of the following constituents would have to be substituted in order to supply a proper carbon and energy source for this bacterium?
   1. NaCO3
   2. NH4SO4
   3. K2HPO4/KH2PO4
   4. Fe2+ and MgCl2
   5. None of the above would have to be substituted
5. A strictly differential growth medium is one that
   1. Would be a good choice to isolate Gram-negative bacteria from a mixed culture containing both Gram-positive and Gram-negative bacteria, respectively
   2. Can yield varying color reactions depending upon the metabolic capabilities of the bacteria growing on it
   3. Contains agents in order to inhibit the growth of certain bacterial types
   4. A, B, and C are all correct

6. A cross-section of the cell envelope of two bacterial cells, A and B, are shown in the figure. Which label is matched with the correct structure?

6. 1. Structure A: lipoprotein
   2. Structure B: S layer O polysaccharide
   3. Structure C: teichoic acids lipoproteins
   4. Structure D: capsule peptidoglycan
   5. Structure E: LPS layer
7. Polysome formation in bacteria is able to occur because
   1. They have a relatively small chromosome
   2. They lack a nuclear membrane
   3. They possess multiple ori sequences
   4. They possess a cell wall
8. Which of the following would occur if a motile bacterium were moving towards an attractant?
   1. A higher frequency of the clockwise rotation of flagella
   2. A greater frequency of the counterclockwise rotation of flagella
   3. A decrease in the frequency of tumbles
   4. B and C are correct
   5. A and B are correct
   6. A, B, and C are correct