10-Why is a stain added to a microbe? A. B. C. D. Recognize the morphology of ce

Question

10-Why is a stain added to a microbe? A. B. C. D. Recognize the morphology of cells To visualize internal structures Make the cells easier to see under them he microscope All of the above 11- The recommended biosafety level(s) for handling microorganisms represent A. the potential of the agent to cause disease B. the conditions under which the agent should be safely handled C. Both A and B are correct D. None of the above is applicable asThe reponmended biosafery levels (BSL) for miero-organisms are described below. Which of the following is A Agents that can cause diseases that do not respond to antimicrobial therapy or to vaccines in healthy related to BSL-4? B. C. D. adults Agents that pose only moderate risk in healthy adults but not likely to spread throughout the community, and readily treatable Agents that can cause disease in healthy adults that can spread very easily throughout the community though can be readily treatable Agents not likely to pose a disease risk to healthy adults 13-Which reagent functions as a decolorizer in the Gram stain? A. Crystal violet B. lodine C. Copper sulfate D. Alcohol 14-What is the mordant used in the Gram stain A. Iodine B. Crystal violet C. Safranin D. Alcohol 15-In the Schaeffer-Fulton method, malachite green is use to stain A. Vegetative portion of the cell B. Capsule C. Endospores D. The fungi

Explanation / Answer

10. By staining it becomes easy to visualise the morphology, anatomical structures etc. Option D is correct.

11. Both A and B are correct. For deciding biosafety level both these are required. Option C is correct.

12. Agents which are not characterised and causes serious disease which are untreatable comes under BSL4. Option A is correct.

13. Alcohol is used as delocalizer and it cuases to remove primary stain. Option D is correct.

14. Gram iodine is used as moderant and help in staining more efficiently. Option A is correct.

15. Malachite green stains the endospore green and bacterial. Body are stained red by saffranin. Option C is correct.

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