<u>Answer:</u>
<em>An oxygen is not attached to the central carbon atom in an amino acid.</em>
<u>Explanation:</u>
To understand this, we need to look at the <em>simple molecular structure of amino acids.</em> The basic structure of amino acid consists of an amine 
, a carboxyl 
functional groups.
There is also a R-Group for a particular amino acid on the side chain of it. Although oxygen is one of the key constituents of amino acid it is not directly attached with the <em>central carbon atom in an amino acid.</em>
Answer:
1. Non-polar group
2. Increase cholesterol in the phospholipid bilayer
Explanation:
1. The plasma membrane of cells is made up of two layers of phospholipids, this is to insure that there is a distinct separation in the contents of the inside of the cell, from the outside. Water (a polar molecule) cannot easily pass through the membrane, hence a non-polar molecule would pass through easier.
2. Cholesterol in the plasma membrane increases fluidity, hence if the plasma membrane's permeability is decreasing due to the cold temperature, increasing fluidity and permeability would then allow the membrane to retain its function.
Take India for example.... people use the bathroom and bathe in rivers!
Now lets say we look at the US our pollution comes from factories, trash that people dont throw away, fertilizers and many more... but the difference is, that in developed countries like the US our water is filtered.... And in India water is not safe to drink
The major organ of the circulatory system that causes blood to flow through the body by its pumping action is the heart.
