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Microbiology
Exam 2
| Question | Answer |
|---|---|
| If you Gram-stained the bacteria that live in the human intestine, you would expect to find mostly | gram-negative rods. |
| Which of the following does not belong with the others? | Enterobacteriales |
| Pathogenic bacteria can be | all of the above, a. motile. b. rods. c. cocci. d. anaerobic. |
| Which of the following is an intracellular parasite? | Rickettsia |
| Which of the following terms is the most specific? | Bacillus (capitalized and italicized) |
| Which one of the following does not belong with the others? | Lactobacillus |
| Which of the following pairs is mismatched? | Helicobacter |
| Spirillum is not classified as a spirochete because spirochetes | possess axial filaments |
| When Legionella was newly discovered, why was it classified with the pseudomonads? | It is an aerobic gram-negative rod |
| Unlike purple and green phototrophic bacteria, cyanobacteria | produce oxygen during photosynthesis. |
| How many phyla are represented in the following list of organisms: Echinococcus, Cyclospora, Aspergillus, Taenia, Toxoplasma, Trichinella? | 4 |
| Which of the following statements about yeasts are true? | a. 1, 2, 3, 4. , Yeasts are fungi, Yeasts can form pseudohyphae, Yeasts reproduce asexually by budding, Yeasts are facultatively anaerobic |
| Which of the following events follows cell fusion in an ascomycete? | d. ascospore formation. |
| The definitive host for Plasmodium vivax is | b. Anopheles. |
| Use the following choices to answer questions 8–10: a. Apicomplexa b. ciliates c. dinoflagellates d. Microsporidia 8. These are obligate intracellular parasites that lack mitochondria. | Microsporidia |
| 9. These are nonmotile parasites with special organelles for penetrating host tissue. | Apicomplexa |
| 10. These photosynthetic organisms can cause paralytic shellfish poisoning. | dinoflagellates |
| Bergey’s Manual of Systematic Bacteriology differs from Bergey’s Manual of Determinative Bacteriology in that the former | b. groups bacteria according to phylogenetic relationships. |
| Bacillus and Lactobacillus are not in the same order. This indicates that which one of the following is not sufficient to assign an organism to a taxon? | e. morphological characteristics. |
| Which of the following is used to classify organisms into the Kingdom Fungi? | d. absorptive; possess cell wall; eukaryotic. |
| Which of the following is false about scientific nomenclature? | b. Names vary with geographical location |
| You could identify an unknown bacterium by all of the following except | e. percentage of guanine + cytosine. |
| The wall-less mycoplasmas are considered to be related to gram positive bacteria . Which of the following would provide the most compelling evidence for this? | a. They share common rRNA sequences. |
| 7. Into which group would you place a multicellular organism that has a mouth and lives inside the human liver? | Animalia |
| 8. Into which group would you place a photosynthetic organism that lacks a nucleus and has a thin peptidoglycan wall surrounded by an outer membrane? | Proteobacteria (gram-negative bacteria) |
| 9. Which is (are) found in all three domains (Bacteria, Archaea, Eukarya)? | 2, 6 |
| 10. Which is (are) found only in prokaryotes? | 3, 5 |
| Place the following in the most likely order for biosynthesis of a bacteriophage: (1) phage lysozyme; (2) mRNA; (3) DNA; (4) viral proteins; (5) DNA polymerase. | d. 3, 5, 2, 4, 1 |
| The molecule serving as mRNA can be incorporated in the newly synthesized virus capsids of all of the following except | c. - strand RNA rhabdoviruses |
| A virus with RNA-dependent RNA polymerase | b. synthesizes double-stranded RNA from an RNA template |
| Which of the following would be the first step in the biosynthesis of a virus with reverse transcriptase? | c. A complementary strand of DNA must be synthesized from an RNA template |
| An example of lysogeny in animals could be | b. latent viral infections |
| The ability of a virus to infect an organism is regulated by | all of the above, the host species. the type of cells, the availability of an attachment site, cell factors necessary for viral replication. |
| Which of the following statements is false? | Viruses multiply inside living cells using viral mRNA, tRNA, and ribosomes. |
| Place the following in the order in which they are found in a host | 3, 1, 2 |
| Which of the following does not initiate DNA synthesis? | a single-stranded RNA virus (Togaviridae) |
| A viral species is not defined on the basis of the disease symptoms it causes. The best example of this is | chickenpox and shingles |
| One of the most common inhabitants of the human intestinal tract and is probably the most familiar. Its presence in water is an indication of fecal contamination | Escherchia |
| Almost all members are potentially pathogenic. Common inhabitants of many animals, especially poultry and cattle. They can contaminate food. | Salmonella |
| Responsible for a disease called bacillary dysentery. Found only in humans. | Shigella |
| Commonly found in soil and water. Many isolates fix nitrogen. One species can cause serious pneumonia in humans. | Klebsiella |
| Produces a red pigment. In hospitals, can be found on catheters, in saline irrigation solutions, and other supposedly sterile solutions. | Serratia |
| Exhibit swarming type of growth. Implicated in many infections of the urinary tract and in wounds. | Proteus |
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