Cannulae and Hami are the cellular structures found in
Show Hint
- Yeast
- Archaea
- Mycoplasma
- Bacteria
The Correct Option is B
Solution and Explanation
Organisms in the domain Archaea possess unique physiological, biochemical, and structural adaptations that distinguish them from both Bacteria and Eukaryotes.
These adaptations allow them to survive in extreme environments, such as deep-sea hydrothermal vents.
Step 3: Detailed Explanation:
Cannulae and hami are unique extracellular appendages found exclusively in certain groups of Archaea:
- Cannulae: These are hollow, tube-like structures found on the surface of marine hyperthermophilic archaea, such as Pyrodictium species.
These tubes connect individual cells into a complex network.
They are heat-stable and maintain their structural integrity at temperatures above \(100^{\circ}\text{C}\), helping cells share nutrients or signals in extreme environments.
- Hami: These are long, helical appendages that end in a three-pronged, grappling-hook-like structure.
They are found on the surface of SM1 euryarchaeal cells (such as Altiarchaeum hamiconexum).
Hami allow these cells to attach to surfaces and form biofilms.
Neither bacteria, yeast (fungi), nor mycoplasma produce these structures.
Therefore, these structures are unique to Archaea.
Step 4: Final Answer:
Cannulae and hami are unique structural appendages found in Archaea, matching Option (B).
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