Virus are made up of the core of genetic material. It could be DNA or RNA. Surrounded by a protein called capsid. Viruses can attach onto other host cells and get inside them and control them. They can also be surrounded by a spiky material called the envelop.<span />
Endangered is when group of species are at the edge of extinction.
Threatening is when group of species are at the risk of extinction in future.
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Answer:
In order for a polar compound to enter into the hydrophobic space of the phospholipid tails, it would need to break the many <u>polar covalent bonds</u> bonds it has formed with the water and enter into a space where these bonds cannot form. Therefore, it is not a repelling action but a "lack of attraction".
Explanation:
<u>Water as polar solvent and the phospholipids:</u>
Water is very different on the molecular and that is due to the more polar nature, which is caused by the hydrogen bonding with in a H₂0 molecule. As the water molecules forms bonds with the other molecules in a specific formation of unequal polarities on its molecules. As the molecules have an unequal amount of charges present on it. For, the phospholipids they have two hydrophobic tails and the hydrophilic head. Through which they form most of the cell membrane structures.
In order to add any polar molecule to the hydrophilic head of the phospholipid there are many covalent bonds which are required to be broken, as these bonds include the covalent bonds found inside the molecular level. While, the hydrophobic tails of the molecules can't arrange themselves to form the bonds with the polar molecules more frequently.