What allows a bacteria to stain positively with gram stain?
Correct answer: D. The bacteria's thick peptidoglycan cell walls
- A. The bacteria is anaerobic
- B. The bacterial sample was pretreated with 3% ethanol
- C. The bacteria's periplasmic space
- D. The bacteria's thick peptidoglycan cell walls
Explanation
Gram-positive bacteria have a thick layer of peptidoglycan in their cell walls, which allows them to take up the crystal violet colour of the Gram stain.
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About Kingdom Prokaryotae
Kingdom Prokaryotae includes bacteria and cyanobacteria, organisms with no membrane-bound nucleus or membrane-bound organelles. It covers their cell wall, capsule, flagella, plasmids, forms of nutrition, binary fission, useful and harmful roles, and the differences between prokaryotic cells and eukaryotic cells.
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