The chemical compounds used to stain bacteria are called dyes/ chromophores. True False Question 17 The surface of a bacterial cell has an overall negative charge. True False Question 18 Improper heat fixing of the smear causes Gram positive cells to release the primary stain crystal violet and accept the counterstain safranin. True False
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The chemical compounds used to stain bacteria are called dyes/chromophores. This statement is true. Dyes or chromophores are used to stain bacteria to make them more visible under a microscope. Answer: $\boxed{\text{True}}$ Show more…
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Adi S.
9. A staining technique that requires one stain (dye) is a _____ staining. A. Simple B. Differential C. Compound 10. Normal flora are primarily beneficial. A. False B. True 11. The genus that produces spores? A. Clostridium B. Escherichia C. Proteus 12. Before you leave the lab you should always wash your hands. A. False B. True 13. Which one of following is a mordant? A. Crystal violet B. Iodine C. Safranin 14. The microscope you use in this lab is a ____ field Microscope. A. Bright B. Dark C. Phase contrast 15. Decolorizing in a Gram staining procedure is performed by acetone/alcohol. A. True B. False
Sri K.
24. A simple stain that leaves the bacteria unstained but stains the background is called a negative stain. 25. False. Immersion oil has a higher refractive index than glass. 26. True. 27. True. 28. False. When performing the gram stain for Staphylococcus epidermidis, pink cocci (spherical bacteria) will be observed under the microscope. 29. False. The lipopolysaccharides of Bacillus subtilis are not known to be toxic.
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