Is there any division of labour among the cells of a colony? If you find the division of labour among the cells and tissue what level of cellular organization is it?
Answers
Answer:
Organs are made of several tissues, each tissue consists of cells that differentiated into specific types with specific functions. Therefore, there is a “division of labor” so to speak. As far as the level, that is considered the tissue level of organization from an anatomical perspective.
Explanation:
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Cyanobacteria are photosynthetic bacteria also known as blue-green algae. A mountain of evidence strongly points to chloroplasts as captured endosymbiotic cyanobacteria.
Just as with plants, cyanobacteria sometimes face the problem of limited nitrogen supply. Fixing nitrogen is an obvious solution, but carries a serious chemical challenge. Nitrogenases are exquisitely sensitive to oxygen, poisoned by tiny amounts, and photosynthesis evolves oxygen.
In nitrogen fixing legumes, the plant builds a specialized tissue — the nodule — around the nitrogen fixing bacteria. In addition to just being a formidable barrier, the plants also deploy their own hemoglobin homologs (leghemoglobin) to remove oxygen from the vicinity of the bacteria.
Cyanobacteria don’t have that option. Instead, a small number of cells in certain filamentous become heterocysts, specialized cells which do not photosynthesize but instead fix nitrogen and have specialized triple-layer cell walls to exclude oxygen.
While checking facts for this entry, I learned that heterocysts can no longer divide — so they are terminally differentiated cells.