Which one of the following is Prokaryote?

The correct answer is Oscillatoria

Concept:

• A prokaryote is an organism that lacks a membrane-bound nucleus and other organelles. These organisms are characterized by their simple cellular structure. They belong to the domains Bacteria and Archaea.
• Prokaryotic cells have genetic material that is not enclosed in a nuclear membrane, and they typically reproduce asexually through binary fission.
• Prokaryotes include bacteria and cyanobacteria (blue-green algae), and they play essential roles in ecosystems, including nitrogen fixation and photosynthesis.

Explanation:

• Oscillatoria: Oscillatoria is a genus of filamentous cyanobacteria, also known as blue-green algae. It is a prokaryotic organism that carries out photosynthesis. Its cells lack a true nucleus and membrane-bound organelles, making it a prokaryote. Oscillatoria is commonly found in freshwater environments and contributes to nutrient cycling through processes like nitrogen fixation.
• Oedogonium: Oedogonium is a genus of filamentous green algae belonging to the eukaryotic domain. It has membrane-bound organelles, including a true nucleus.
• Chondrus crispus: Chondrus crispus, commonly known as Irish moss, is a type of red algae. It is a eukaryotic organism with a complex cellular structure, including a nucleus and other organelles.
• Chara: Chara is a genus of green algae that belongs to the eukaryotic domain. It has a true nucleus and membrane-bound organelles. It is commonly found in freshwater ecosystems.