The polar end of the phospholipid plasma membrane is hydrophilic hydrophobic

The correct answer for the fill in the blank is hydrophilic.

Plasma membrane is present around the cells of all living organisms. It is made up of two layers of phospholipids. These phospholipids are amphipathic in nature. This means that they have two regions, which are hydrophobic ( water hating, non polar) tail and hydrophilic ( water loving, polar) head.

The polar end of phospholipid plasma membrane is hydrophilic in nature. It faces the aqueous compartment, which is present outside and inside the cell. Since water is also hydrophilic in nature, therefore, these polar ends of phospholipids are aligned in this manner.

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answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.