Bacteria tend to stain more readily with cationic (positively charged) dyes because bacteria a. contain large amounts of alkaline substances c. are neutral b. contain large amounts of acidic substances d. have thick cell walls
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Bacteria tend to stain more readily with cationic (positively charged) dyes because bacteria a. contain large amounts of alkaline substances c. are neutral b. contain large amounts of acidic substances d. have thick cell walls
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- Bacteria tend to stain more readily with cationic (positively charged) dyes because bacterial surfaces a. contain large amounts of alkaline substances. b. contain large amounts of acidic substances. c. are neutral. d. have thick cell walls.Why are staining methods used in microbiology? Choose all that apply A. Staining results can have medical implications for an infected B. To clearly see the internal structures of the bacteria C. The stains can be used to dinginuish between bacteria type D. It is easier to very small microscope.Bacteria may be Gram + or Gram - due to their difference in staining. This stain is significant to treating bacterial diseases because A. Some people are immune to one type of bacteria but not the other B. The types of antibiotics prescribed will be based in part on which type of bacteria is causing the infection. C. Gram - always cause disease, Gram positives don't D. You can eliminate a large group of bacteria by knowing if infection is caused by either a Gram + or a Gram - which makes it easier to treat. E. B and D are correct
- UV light is able to damage bacterial cells by:a. preventing mitosis b. damaging DNA c. dissolving cell membranes d. coagulating cytoplasmthe purpose of a mordant in Gram stain is a. to prevent the crystal violet from leaving the cell b. to make bacteria cell larger c. to fix iodine inside the cell d. to remove simple stainWhich of the following is NOT correctly matched? A. Halophile – microbe that can grow in an environment with high osmotic pressure (e.g., salt) B. None of the other four answers (all are correctly matched) C. Agar – complex polysaccharide from seaweed used as a solidifying agent in culture media D. Colony – a population of microbial cells arising from a single cell or spore or from a group of attached cells E. Capnophile – microbe requiring an elevated molecular oxygen (O2) environment for optimal growth
- 7. Use the image to answer the following questions: (2) A student collects some of this bacteria to create a slide then performs a Gram stain as shown here: A. How many different types of bacteria are growing on the petri dish? B. How do you know (how can you tell the difference between the types of bacteria)? C. What is the Gram reaction and morphology of these cells? D. Based on the Gram stain, could this colony be used to grow pure culture? How do you know?Prokaryotes stain as Gram-positive or Gram-negative because of differences in the_______. a. cell wall b. cytoplasm c. nucleus d. chromosomeA medium in which all the components are known is: A. Minimal medium B. Synthetic or defined medium C. Selective medium D. Complete medium E. Complex medium F. Differential medium G. General purpose medium
- Bacteria are microscopic single-celled organisms that are far too small to detect with the naked eye. Describe how you could grow enough bacteria in a colony to be viewed without a microscope. What is the relationship between the cells that form a colony?You have just set your microscope up for use and turn it on. You can not see field of view. a.possible problems b.solutionsWhen viewed under a microscope, bacteria appear as red rods after they have been stained. Explain a quick process for determining the outcome of this experiment.