Showing 1 to 20 of 4118 Questions

Question & Answer:

  • Jacob, Monod, and Pardee constructed a mutant strain of E. coli that carried a lacI- gene mutation (encodes the lac repressor). Which is TRUE of this mutant strain?
    a. Transcription of the lac operon is repressed.
    b. Transcription of the lac operon does not change.
    c. The lac operon is constitutively expressed.
    d. Nonfunctional proteins are produced.
    e. The lac operon is constitutively expressed and nonfunctional proteins are produced.
  • Which of the following is NOT one of the major characteristics of the immune system?
    A. recognizes and responds quickly to an antigen to which it has responded previously.
    B. responds specifically against a particular antigen.
    C. produces an inflammation.
    D. distinguishes self from nonself
  • Develop one argument in support of or refuting the following statement: “Viruses are living microorganisms.

  • The following is an excerpt from a news article:
    “Dr. Miller suggests that the germicidal effect may be due to inhibition of protein synthesis. He and his research associates are now set to test this theory in their laboratory over the next two months.”
    Explain whether or not the bolded term was used correctly in this example.

  • Discuss three examples of how humans utilize microbes and their products today.

  • Discuss how the findings of Louis Pasteur may have inspired Joseph Lister’s development of aseptic techniques in surgical settings.

  • Compare and contrast the Woese-Fox system with the Whittaker system of classification, discussing how genetic analysis provided information leading to the identification of a third cell lineage.

  • Differentiate the terms emerging disease and reemerging disease, providing examples of each.

  • Based upon your reading of Insight 1.1, conduct additional research and discuss the current policy on infectious disease quarantine and how this process is administered in the United States.

  • You are a scientist researching West Nile virus, a mosquito-borne pathogen. You note that the number of cases of West Nile disease in your county skyrocketed to their highest levels ever this past summer, which also was the wettest summer in 100 years. Using the scientific method, develop a sound hypothesis explaining the increase in disease cases last summer and a method for testing this hypothesis.

  • Support or refute the following statement: “Double bonding provides the plasma membrane with flexibility.”

  • The burning of coal imparts a large amount of sulfur dioxide into the atmosphere, which, when combined with water, creates sulfuric acid. Explain how such “acid rain” affects the water chemistry of inland lakes and streams.

  • Draw a simple model of the following molecules: CH4, NaCl, H2O. Provide a definition of polar molecule, and identify the polar molecule listed here.

  • Provide a concise summary of the five basic techniques used to manipulate, grow, examine, and characterize microorganisms in a laboratory.

  • What is the functional type of mannitol salt agar (MSA)? Explain how it is utilized in the isolation and identification of Staphylococcus species.

  • You are a scientist studying a marsh area contaminated with PCBs, toxic chemical compounds found commonly in industrial waste. Initial microscopic analysis of the soil reveals the presence of motile cells that measure in the micrometer range. You hypothesize that these microbes may be useful in bioremediation of the toxic waste. Thinking about microbial sampling and isolation, describe a method for culturing these microbes back in your laboratory.

  • Summarize three isolation techniques. Explain which method is utilized most often in a laboratory and how a colony produced by this method can be used to create a pure culture.

  • Create a short paragraph to differentiate among the following terms: pure culture, subculture, mixed culture, contaminated culture, and stock culture.

  • For each of the following scenarios, explain which type of microscope(s) would provide the best image.
    a. When motility in a live specimen must be viewed
    b. When intracellular structures must be viewed
    c. When identification of a microbe based on surface structures must be determined
    d. When diagnosis of a prion disease must be determined

  • a. Create a paragraph to differentiate among the following terms: positive stain, negative stain, simple stain, and differential stain.
    b. For each of the following scenarios, explain which staining technique(s) should be used.
    • Analyzing cell wall composition
    • Observing structures for locomotion
    • Identifying a structure enhancing pathogenicity