A unicellular autotrophic organism isolated from a pond sample performs oxygenic photosynthesis despite lacking chloroplasts or a membrane-bound nucleus. Chemical testing confirms that its cell wall structural matrix consists of peptidoglycan (murein). Which of the following statements accurately classifies this organism and describes its structural characteristics within Kingdom Monera?
- AThe organism is a cyanobacterium whose cell wall is composed of cellulose, matching the cell wall composition of green plants.
- The organism is a cyanobacterium possessing a cell wall made of peptidoglycan, distinguishing it from eukaryotic plant cells.Cevap
- CThe organism is an acellular photosynthetic virus surrounded by a protein capsid rather than a peptidoglycan cell wall.
- DThe organism is a nitrifying bacterium that manufactures glucose by oxidising ammonia into nitrates inside chloroplasts.
Cevap
The organism is a cyanobacterium possessing a cell wall made of peptidoglycan, distinguishing it from eukaryotic plant cells.
The organism described exhibits prokaryotic organization (absence of chloroplasts and membrane-bound nucleus) paired with oxygenic photosynthesis, which defines cyanobacteria within Kingdom Monera. All Moneran cell walls feature a peptidoglycan (murein) matrix rather than the cellulose found in plant cells.
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Anahtar Kavram
Structural features of Kingdom Monera (peptidoglycan cell wall, prokaryotic organization, thylakoids in cyanobacteria)
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