osmoregulation in migratory fish osmoregulation in freswater fish osmoregultion in marine fish counter current mechanism formation of urine ultra filteration excretion genetic code characteristics mutation down's syndrome gene mutation genome mutation chromosomal aberration chemical composition of gene ultra structure of eukaryotic gene ultra structure of prokaryotic gene gene concept gene osmosis diffusion exocytosis phagocytosis endocytosis transport in vesicles sodium pottasium pump na+ k+ pump passive transport active transport cellular transport production of proteins biology botany zoology b.sc. central dogma of molecular biology translation transcription protein synthesis
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