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Question
One of these animal excretes amino acid without deamination.
One of these animal excretes amino acid without deamination.
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Solution
The correct option is C Unio
Certain invertebrates like some molluscs (Unio, Limnaea) and some echinoderms (Asterias, Paracentrotus) excrete out excess amino acid as such without undergoing any deamination, these animals are called aminotelic. Elimination of nitrogenous waste inthe form of amino acids is called aminotelism.
Anaerobic metabolism results in the accumulation of the amino acids like alanine and glutamate inside the cell. During hypo-osmotic stress (cell have more concentration of salts/solutes than its surrounding) the intracellular concentrations of amino acids decreases by extrusion from the cells followed by deamination and / or excretion. Thus amino acids (when in excess) are directly excreted as a part of osmoregulation in marine molluscs and echinoderms under salinity stress.
Certain invertebrates like some molluscs (Unio, Limnaea) and some echinoderms (Asterias, Paracentrotus) excrete out excess amino acid as such without undergoing any deamination, these animals are called aminotelic. Elimination of nitrogenous waste inthe form of amino acids is called aminotelism.
Anaerobic metabolism results in the accumulation of the amino acids like alanine and glutamate inside the cell. During hypo-osmotic stress (cell have more concentration of salts/solutes than its surrounding) the intracellular concentrations of amino acids decreases by extrusion from the cells followed by deamination and / or excretion. Thus amino acids (when in excess) are directly excreted as a part of osmoregulation in marine molluscs and echinoderms under salinity stress.
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