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BIO 250 STRAIGHTERLINE MICROBIOLOGY REAL PRACTICE 2025 QUESTIONS ANDcorrect answerS. The purpose of staining cells on a microscope slide is to ______. Select one: a. kill them b. secure them to the slide c. enlarge the cells d. add contrast to see them better e. observe motility -correct answer-d. add contrast to see them better A microbiologist must culture a patient's feces for intestinal pathogens. Which of the following components would likely be present in a selective medium for this purpose? Select one: a. NaCl b. Sheep red blood cells c. Bile salts d. Thioglycolic acid e. Peptone -correct answer-c. Bile salts Organisms called parasites are ______. Select one: a. always harmful to their host b. the decomposers in ecosystems c. always viruses d. free-living -correct answer-always harmful to their host Trees of life that illustrate the phylogenetic relationships of all organisms were traditionally based on ______; newer methods for determining phylogeny rely on ______. Select one: