Which of the following is best seen with or cannot be seen without oil immersion

Question

Which of the following is best seen with or cannot be seen without oil immersion and a light microscope? a. Viruses b. Bacteria c. fungi d. protozoa e. plants The total magnification achieved when using a 5X eyepiece and a 100X objective is a. 5000X b. 500X c. 100X d. 50x e. None of these Above In preparing a smear, the slide is heat fixed by flaming it a. to bind bacteria to the slide b. to kill bacteria c. only after the slide has dried completely d. to stop bacteria washing off the slide e. all the above The solidifying agent used most successfully in the cultivation of bacterial on solid media is a. gelatin. b. peptone. c. silica gel d. agar. e. starch.

Explanation / Answer

9. Bacteria

10. 500X

11. all of the above (e)

12. agar (it is a polysaccharide extract which is obtained from seaweed, it remains in a solid form at 37 degrees.)

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