Hydrophobic effect is the tendency of non polar molecules (hydrophobic) in a solvent that is polar to interact with each other resulting to a hydrophobic interaction. These non polar molecules are called hydrophobes and are made of long chains of carbon that are water hating (do not interact with water). In this case,the hydrophobic interactions are most likely to occur on the core of a water soluble protein.
Essential amino acids are those amino acids which are not synthesized by our body. They are supplied through the food we eat. If a person is not getting the required essential amino acids in the body, it will affect both physical and mental health. In the absence of essential amino acid body breaks down muscle tissue to get the required amino acid, therefore muscle wasting is the first symptom of the deficiency of essential amino acids. Low level of essential amino acid may cause high anxiety.
This statement is true. Developing countries indeed tend to have more people in urban areas than rural areas. For example, New York City has the massive population in the state of New York, compared to its rural areas upstate.
From what I have been taught at any point mutations can occur.