BIOL 271 MICROBIOLOGY W/LAB MODULE 4 EXAM REVIEW PORTAGE LEARNING QUESTIONS AND CORRECT ANSWERS LATEST UPDATE 2026 .

1. True or False Growth media is best suited for distinguishing between two similar species of bacteria False. Growth media is designed to simply support (and not restrict) microbial growth 2. A researcher is asked to determine which of two vials contains e coli and which contains salmonella. Knowing both gram-negative while only one of them is capable of fermenting lactose, which type of media would be best suited (multiple choice) CORRECT ANSWER Ditterential media distinguishes between two, often related, microbes 3. A researcher is asked to determine if a sample contains Neisseria menin-gitides. Knowing Neisseria meningitides is slow growing and other foreign microbes may also be present in the culture, which type of media would be best suited? (multiple choice) CORRECT ANSWER Selectivemedia 4. What are the requirements of a fastidious microbe? (short answer) CORRECT ANSWER A fastidious microbe is an organism with complex growth requirements such that is absent it will not grow. Enriched medias thus contain these specific and essential nutrients required for the growth of a particular subset of microorganisms. 5. True or False LB agar is classified as a selective, non-differential media CORRECT ANSWER False 6. What is agar used for in microbiology? (short answer) CORRECT ANSWER Agarisusedtocreatea solid, smooth surface on which microbes can grow 7. Alpha hemolysis (matching) CORRECT ANSWER Incomplete hemolytic activity 8. Beta hemolysis (matching) CORRECT ANSWER Complete hemolytic activity 9. Gamma hemolysis (matching) CORRECT ANSWER no hemolytic activity 10. Columbia CNA agar is most closely related to which media (multiple choice)- CORRECT ANSWER blood agar 11. True or False Chocolate agar gets its brown color from cocoa to produce an enriched media CORRECT ANSWER false 12. True or False Chocolate is not a component of chocolate agar plates CORRECT ANSWER true 13. A researcher is studying a strain of e coli currently growing on a MacConkey plate. However, the researcher can't remember if