Although amoeba and Bacteria are unicellular organisms they belong to two different kingdoms What is the reason for this?
Answers
Answer:
As we know that kingdoms had been Classified on the basis of Eukaryotic and prokaryotic nucleus. Since Amoeba possess Eukaryotic nucleus and bacteria possess prokaryotic nucleus that's why they have been grouped in different kingdoms.
Answer:
Amoeba and Bacteria are both unicellular, but still, they are placed in different kingdoms due to their difference in cell type and cellular characteristics.
Amoeba falls under the category of eukaryotic cells, whereas, Bacteria fall under the category of prokaryotic cells.
Explanation:
What is a cell?
A cell is defined as the basic structural and functional unit of life.
Types of Cells:
Based on the cellular structure and modifications, cells are widely categorised into two distinct types:
- Prokaryotic cells
- Eukaryotic cells
What are prokaryotic cells?
Prokaryotic cells are the primitive types of cells that lack a well-organized nucleus wrapped within a nuclear membrane and other organelles like mitochondria, Golgi bodies, endoplasmic reticulum, etc.
E.g., members of Kingdom Monera.
What are eukaryotic cells?
Eukaryotic cells are the ones which have a well-defined nucleus wrapped within a nuclear membrane and have complex organelles having definite functions of their own such as mitochondria for cellular respiration, Golgi bodies for secretory bodies, etc.
E.g., members of Kingdom Protista and higher Kingdoms.
Characteristic comparison between Amoeba and Bacteria:
The general characteristic features of Bacteria are:
- True nucleus is absent. (nucleoid). The nuclear material remains floating in the cytoplasm of the cell
- Presence of circular DNA
- Complex organelles like mitochondria, Golgi bodies, etc. are absent
- DNA replication, Transcription, and, Translation all occur in the cytosol. Transcription and Translation often coincide
- Plasmid DNA (extra-circular) may be present
- Presence of 70S ribosome
- Simpler cell membrane structure
- Lacks cytoskeleton
The general characteristics features of Amoeba are:
- Presence of true nucleus. The nuclear material remains confined within the nucleus which is separated from the cytosol by a nuclear membrane
- Presence of linear DNA
- Presence of complex organelles having dedicated functions
- DNA replication and Transcription occur in the nucleus. Translation occurs in the cytosol.
- Absence of any extra-circular material (plasmid)
- Presence of 80S ribosomes.
- Complex cell membrane structure with the presence of receptors
- Presence of cytoskeleton (actin and myosin filaments)
Thus, by comparison, we can see that Amoeba is more advanced in aspects of cellular characteristics than the bacterial cells and so, it is placed under Kingdom Protista which constitutes unicellular eukaryotes and Bacteria placed under Kingdom Monera.
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