Gram +ve bacteria on treatment with crystal violet dye give _________colour?
Correct answer: C. purple
- A. red
- B. green
- C. purple
- D. pink
Explanation
Gram-positive bacteria retain the crystal violet-iodine complex because their thick peptidoglycan wall is not decolorized by alcohol, so they appear purple. Gram-negative bacteria lose the crystal violet and later take the counterstain, so students may choose red or pink by mixing up the two Gram reactions.
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About Prokaryotic and Eukaryotic Cells
Prokaryotic cells lack a membrane-bound nucleus and complex membrane-bound organelles, whereas eukaryotic cells contain a nucleus, specialized organelles and a cytoskeleton. Comparisons include DNA organization, ribosomes, cell walls, size, division and examples such as bacteria, archaea, protists, fungi, plants and animals.
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