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Micro -Chap 1 - 6
Microbiology chap 1
| Question | Answer |
|---|---|
| Clotrisdium botulinum is made virulent by incorporated prophage genes encoding for the botulinum toxin. What term describes this process? | Lysogenic conversion |
| Sterilization is achieved by? | steam autoclave |
| Infectious naked strands of RNA are called | viroids |
| In microscopy, the term resolution | refers to the ability to distinguish fine structure and detail in a specimen |
| Which microscope uses visible light? | differential interference contrast microscope |
| Which of the following is not a typical characteristic of most bacterial plasma membranes? | contains cholesterol |
| When a virus enters a lysogenic phase, it means | the virus is integrated into the DNA of the host cell an is latent |
| Which of the following is not useful for observing living cells? | scanning electron microscope |
| Functions of the glycolyx includes all of the following EXCEPT | Binary fusion |
| Which microscope is used to observe a specimen that emits light when illuminated with an ultraviolet light? | Fluorescence microscope |
| The purpose of a mordant in the Gram stain is to: | prevent the crystal violet from leaving the cells |
| how do spirochetes and spirilla differ? | Spirilla have an external flagella but spirochetes have axial filaments |
| in general, most DNA viruses multiply in the host cell's______, while most RNA viruses multiply in the host cell's______. | nucleus, cytoplasm |
| Each of the following organisms would be considered a microbe EXCEPT | mushroom |
| Which of the following statement is INCORRECT regarding prokaryotic cells? | They lack plasma membrane |
| What structure does light pass through after leaving the condenser in a compound light microscope? | Specimen |
| The resolution of a microscope can be improved by changing the | wavelength of light |
| Which of the following statements about gram-negative cell walls is FALSE? | they are toxic to humans |
| Which of the following pairs is miss-matched? | fluorescence microscopie - uses a fluorescent light |
| The DNA found in most bacterial cells | is circular in structure |
| The negative stain is used to | visualize capsules |
| Which of the following statement is TRUE? | Endospores allow a cell to survive environmental changes |
| Infectious protein particles are called? | Prions |
| Virus capsids are made from subunits called | Capsomeres |
| In the Staphylococcus aureus, aureus is the | specific name |
| You are preforming a gram stain on a gram-positive bacteria and you stop after the addition of the first dye. What is the appearance of the bacteria at this point? | purple |
| You are performing a Gram stain on a gram-negative bacteria and you stop after the decolorization step. What is the appearance of the bacteria at the point? | Colorless |
| Viruses acquire envelopes around their nucleocapsids during | release |
| Which of the following is not associated with every virus? | envolope |
| A gram-positive suddenly acquires resistance to the antibiotic methicillin. This trait most likely occurred due to: | conjugation |
| Which of the following is NOT true regarding the acid fast stain? | if cells are acid-fast, they are gram negative |
| Fimbriae and pili differ in that | pili are used for transfer of DNA and motility |
| Each of the following statements concerning the gram-positive cell wall is true EXCEPT | it protects the cell in hypertonic environments |
| Which structure acts like an "invisible cloak" and protects bacteria from being phagocytized? | capsule |
| Which of the following would most likely be used to lyse the bacterial cells for nucleic acid isolation? | Lysozyme |
| Which microscope is used to see internal structures of the cell in a natural state? | phase-contrast microscope |
| Viruses that cause infection resulting in alternating periods of activity with symptoms and inactivity without symptoms are called? | latent |
| Satellite viruses are | dependent on other viruses for replication |
| Who is credited with first observing microorganisms? | Anton van Leeuwenhoek |
| Assume you stain Bacillus by applying malachite green with het and then counterstaining with safranin. Through the microscope, the green structures are? | Endospores |
| which of the following pairs is mismatched? | basic-dye - negative stain |
| Regarding Louis pasteur's experiments with the S-neck flask, which of the following statements is TRUE? | All of the above |
| Which of the following places the steps of the Gram stain in the correct order? | 2 (crystal violet) - 4 (iodine) - 1 (Alcohol-acetone) - 3 (Safranin) |
| Which of the following structures is NOT found in some prokaryotic cells? | cilium |
| Which of the following will nor support viral cultivation? | Blood-agar |
| Which of the following is NOT equal to 1 nm? | 100 um |
Created by:
CaityK123