What is leghaemoglobin ?

Leg-haemoglobin is pinkish pigment found in the root nodules of leguminous plants. It is pinkish in colour. Leghaemolglobin binds to oxgen and creates anaerobic conditions inside the root nodule. 
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What are ion channels ?

The ion channels are transmembrane proteins that function in tranporting specific ions through them and controlling their flow across the membrane. The passive movement of ions into the apoplast

usually occurs through ion-channels,

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Name two sulphur containing amino acids.


Methionine and cysteine are the two sulpgur conyaining amino-acids.
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What is meant by outer-space of cells?

The outer-space of the cells includes the intercellular spaces and the cell wall.
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What are bacteroids ?

Bacteroids are an irregularly shaped form of a Rhizobium a  nitrogen-fixing bacteria, found especially in root nodules of legumes.
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