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1)Protein is composed of amino acid.

We can identify protein by sequencing amino acids in peptide.

Carbohydrates is primarily avilabke energy source.

2) Proteins and nucleic acids are made up of C H O But carbohydrates and lipids consist of C H O N.

3)Nucleic acid DNA and RNA store and transmit genetic information from one generation to next generation.

Nucleic acid as present in body therefore not considered as essential nutrients.So dietary sources are plant and animal foods like meat fish vegetables etc.

Genes are turned on and off in different patterns during development to make a brain cell look and act different from a liver cell or a muscle cell for example. Gene regulation also allows cells to react quickly to changes in their environment.