Students were asked to give a guess about a unicellular organism with darkly stained nucleus. Which of the following can be straight away excluded from the list:
Correct answer: D. Lactobacillus
- A. Paramecium
- B. Amoeba
- C. Plasmodium
- D. Lactobacillus
Explanation
Lactobacillus is a genus of bacteria, and bacteria do not have nuclei in the same way that eukaryotic cells (such as protists) do. Bacterial genetic material is contained within a region called the nucleoid, which is not membrane-bound and does not exhibit the same dark staining characteristics as eukaryotic nuclei. Since Lactobacillus is a bacterium and not a unicellular organism with a darkly stained nucleus, it can be excluded from the list.
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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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