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Many legumes have root nodules that provide a home for symbiotic nitrogen-fixing bacteria called rhizobia. This relationship is particularly common in nitrogen-limited conditions. The Rhizobia convert nitrogen gas from the atmosphere into ammonia, which is then used in the formation of amino acids and nucleotides .
A temporary cytoplasmic extension is known as pseudopodium, which means literally 'false foot'. Pseudopodia are powered by microfilaments near the cellular membrane. About half of the internal space in an amoeba contains microfilaments. A pseudopodium contains both granuloplasm and hyaloplasm.