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- A cell wall is a structural layer surrounding some types of cells , just outside the cell membrane . It can be tough , flexible , and sometimes rigid . It provides the cell with both structural support and protection , and also acts as a filtering mechanism.Cell walls are present in most prokaryotes ( except mollicute bacteria ) , in algae , fungi and eukaryotes including plants but are absent in animals . A major function is to act as pressure vessels , preventing over - expansion of the cell when water enters .
- Bological tissues are behind this.
- No , because Roots only absorb water from the moisture present in soil . Only some plants like money plant have their roots directly contact with water .
- The small intestine , at around 20 feet long , efficiently absorbs water into the cell membrane and bloodstream . From here , water will travel to cells across the body , providing them with the hydration to perform daily functions efficiently . But the journey of the water you drink doesn't stop there .
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1) Phospholipid bilayer
A group of phospholipids (consisting of a phosphate head and two fatty acid tails) arranged into a double layer, the phospholipid bilayer is a semipermeable membrane that is very specific in its permeability.
2) Being cylindrical, phospholipid molecules spontaneously form bilayers in aqueous environments. In this energetically most-favorable arrangement, the hydrophilic heads face the water at each surface of the bilayer, and the hydrophobic tails are shielded from the water in the interior.
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