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The water expulsion vesicle (also known as a contractile vesicle) is an important osmoregulatory organelle in freshwater protists, which are hyperosmotic to surrounding water. Water constantly diffuses into cell and could cause the cell to burst if there wasn't some way to get it out. That is what water expulsion vesicle does. A network of collecting tubules extends throughout cells, and rich supply of mitochondria on the surface of tubules provides energy required to pump water from cytoplasm into the tubules. Tubules dump the water they've collected into water expulsion vesicle, which slowly fills. Once full, vesicle's membrane fuses with the outer plasma membrane creating a pore out of which excess water flows.
what are disadvantages that protozoan causes
Explain what is Organismal Ecology? Ecology at the Level of Individuals: We define ecology as the study of the relationships between organisms and the relationships between o
What is a recessive gene? With the birth of a child, it gets its genes from both parents. Some genes 'override' other genes. Using hair color as instance: If single parent i
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Discuss in detail about the Mitochondria An important function of the cell is to derive energy from the different oxidisable nutrients, such as, carbohydrates and fats supplied
Protozoans ingest food by phagocytosis, and consequently, the ingested food is surrounded by a plasma membrane creating a food vacuole, or phagosome. Digestion does not start until
Define Health Benefits of Other Dietary Factors with Antinutritional Effects? Despite the predominantly nutritional antagonistic effects of the factors described above, there i
Natural selection can therefore mean differential reproduction among members of the sarne gene pool. We earlier said that selection would promote those alleles that give rise to ph
Neurulation in Amphibians The first step in the neurulation process is the flattening and thickening of dorsal ectoderm to form neural plate. The plate of cells are different
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