All are the characteristics of Gram-positive bacteria except:
Correct answer: D. Stain pink with primary dye
- A. High content of peptidoglycan
- B. High permeability
- C. Teichoic acid is present
- D. Stain pink with primary dye
Explanation
Gram-positive bacteria stain purple with the primary dye in the Gram staining procedure. This is due to their thick peptidoglycan layer that retains the crystal violet dye during the staining process. Gram-negative bacteria, on the other hand, stain pink due to the thinner peptidoglycan layer and the presence of an outer membrane that can be penetrated by the counterstain safranin.
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Biological classification uses taxonomic ranks, binomial nomenclature and shared characteristics to organize life into kingdoms. The major groups include prokaryotes, protists, fungi, plants and animals, with comparisons based on cell type, cell wall, nutrition, body organization, reproduction and evolutionary relationships; prokaryotes lack a membrane-bound nucleus.
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