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#unicellular

4 public questions tagged with this topic.

Dictyostelium

Transition unicellular-multicellular regulated by:

Unicellular to multicellular transition is triggered by nutritional status rather than oxygen, pH, or temperature cues dominant in soil microenvironment. Decline in bacterial prey reduces intracellular amino acids and folate, decreasing TORC1 activity, activating YakA protein kinase, and permitting expression of early developmental proteins. Folate receptor downregulation and cAR1 upregulation switch chemotaxis preference from bacteria to cAMP. Nutrient depletion also induces autophagy providing metabolites for development without external food. Oxygen depletion would affect aeration but not i

Ref: Nature, Dictyostelium starvation response - TOR downregulation and YakA activation triggering multicellular transition.

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General Biology of Protists

Most protists are

Ecologically, most protists are aquatic inhabitants of oceans, freshwater lakes, ponds, and moist soils where water film supports motility, osmoregulation, and nutrient acquisition. Planktonic phototrophic protists like diatoms and dinoflagellates contribute major primary production, while heterotrophic protists graze bacteria regulating microbial loops. Aquatic medium provides buoyancy, dispersal, and continuous water activity essential for flagellar function and contractile vacuole operation in freshwater species. Terrestrial forms remain restricted to damp leaf litter, parasitic niches, or

Ref: OpenStax Biology 2e Chapter 23 Most protists aquatic; NCERT Class 11 Chapter 2 Protists primarily aquatic planktonic habitat

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