<span>c. The molecules are closer together as a gas than they do as a liquid.</span>
represents amine functional group and 
represents carboxylic acid functional group. When these both functional groups are substituted onto a single carbon atom, then amino acid is formed.
The organic compound consists of functional group and functional group with a side chain is said to be an amino acid.
A: amine group is .
C: carboxylic acid group is
B: amino acid represents functional group and functional group which are substituted onto a single carbon atom.
D: carbohydrate: the general formula of carbohydrate is 
.
Hence, amino acid is the correct answer.
The pH meter can only be used to differentiate between weak and strong acids providing that the concentrations are known. However, it is convenient to determine the concentration of an acid (or base) by titration.
Glucose is blood sugar and is the main source for metabolism. Galactose is half of "milk sugar" (aka lactose). Fructose is "fruit sugar." it is true that all of these are 6- carbon sugars, but its how they are rearranged. "Shape determines function."
2 C5H12O + 15 O2 = 10 CO2 + 12 H2O
Hope this helped :)
