Answer:
Explanation:
Cyanobacteria, also known as blue-green algae, are organisms that obtain their energy through photosynthesis.
1. Cyanobacteria are considered gram-negative. However, studies show that their envelope exhibit some gram-positive characteristics.
2. Cyanobacteria and other organisms, such as algae, use photosynthesis take the energy from light (the sun), which results in the generation of oxygen as a byproduct. Therefore, they are oxygenic phototrophs.
3. Anoxygenic organisms don't generate oxygen as a byproduct and use hydrogen sulfide rather than water. Although most cyanobacteria are oxygenic phototrophs, few species, such as Oscillatoria limnetica, have developed environmental adaptations such as the ability of sulphide-dependent anoxygenic photosynthesis (Hamilton, 2019).
4. and 5. Some species of cyanobacteria form filamentous multicellular associations (some are unicellular species) and synthesize the enzyme nitrogenase to fix molecular nitrogen.
