Paramecium and other unicellular eukaryotes that live in hypotonic environments have cell membranes that limit water uptake, while those living in isotonic environments have membranes that are more permeable to water. Describe what water regulation adaptations might have evolved in unicellular eukaryotes in hypertonic habitats such as the Great Salt Lake and in habitats with changing salt concentration.

The movement water or a solvent through a semipermeable membrane like the cell membrane into a solution of higher solute concentration is known as osmosis. An easy way to learn the net movement of water is that water tends to move to the hypertonic solution. In this question water will have a tendency to move out of the cell (plasmolysis).

Cells could have a higher concentration of salt inside the cell, this would require a mechanism like membrane channels that could facilitate the entrance of salts. This could be complemented with having membranes that are more permeable allowing more water to enter the cell to avoid plasmolisis.

ahsan57900 ahsan57900 · Answer 2 · 2021-10-28T16:12:25+02:00

Having less permeable membrane is the adaptation that is present in the unicellular eukaryotes in hypertonic habitats.

Protists living in hypertonic ponds may store concentrated solutes inside the cell in order to equalize its inner concentration with Great Salt Lake. For moving across the membrane, protists also use active transport.

Protists would have less permeable membranes than those in hypotonic or Isotonic environments which leads to less water to enter in the body of that protist so we can conclude that the presence of less permeable membrane is the adaptation in unicellular eukaryotes.

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