Question

prokarotic organisms is capable for nitrogen fixation specialised cell is called heterocyst​

Answer 1

Answer:

this statement is true

Explanation:

its Avishkar

Answer 2

Explanation:

Heterocysts or heterocytes are specialized nitrogen-fixing cells formed during nitrogen starvation by some filamentous cyanobacteria, such as Nostoc punctiforme, Cylindrospermum stagnale, and Anabaena sphaerica.[1] They fix nitrogen from dinitrogen (N2) in the air using the enzyme nitrogenase, in order to provide the cells in the filament with nitrogen for biosynthesis.[2] Nitrogenase is inactivated by oxygen, so the heterocyst must create a microanaerobic environment. The heterocysts' unique structure and physiology require a global change in gene expression. For example, heterocysts:

produce three additional cell walls, including one of glycolipid that forms a hydrophobic barrier to oxygen

produce nitrogenase and other proteins involved in nitrogen fixation

degrade photosystem II, which produces oxygen

up-regulate glycolytic enzymes

produce proteins that scavenge any remaining oxygen

contain polar plugs composed of cyanophycin which slows down cell-to-cell diffusion

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