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Why is iodine used in a gram stain?

a) To bind to the cell wall and make it thicker
b) To make the color darker
c) To bind to the first stain so it isn't washed out of Gram-positive cells
d) To bind to the cell membrane to make it less permeable
e) To bind to the second stain and block it from being washed out of Gram-negative cells

Sagot :