A) red
B) green
C) purple
D) black
Correct Answer: A
Solution :
Hans Christian Gram (1884) develpoed a staining technique with the help of which all bacteria can be grouped into two categories : Gram negative bacteria (-) : These have thin cell wall which loses crystal violet stain when washed with alcohol and takes up red colour of saffranin when counter stained Gram positive bacteria : These have thick cell wall comperatively to Gram negative bacteria and do not lose crystal violet, stain after washing with alcohol. Thus remain purple.You need to login to perform this action.
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