Here's why:
* Long chains: Cyanobacteria are known for their ability to form long chains of individual cells, which are called filaments.
* Helical arrangement: Within these filaments, the individual cells are often arranged in a helical or spiral shape. This spiral arrangement allows them to efficiently capture sunlight for photosynthesis.
Examples of filamentous cyanobacteria with helical chains include:
* Spirulina: A common dietary supplement known for its high protein content.
* Oscillatoria: A genus of cyanobacteria that often forms thick, slimy mats in water.
* Anabaena: A genus of nitrogen-fixing cyanobacteria that can form blooms in lakes and ponds.
It's important to note that not all cyanobacteria form long chains or have a helical arrangement. There are also unicellular and colonial forms. However, the helical arrangement within filaments is a common characteristic of many cyanobacteria.
