What are the major functions of: Carbohydrates, lipids, proteins and nucleic acids?

What is the basic structure and functions of carbohydrates, lipids, proteins and nucleic acids?

I am so confussed with this. Biology confusses me a lot. Can someone please explain this to me in a easy to understand way!
Answer:

Carbohydrate - polymer consisting of monosaccharides (e.g., glucose monomers) Lipids - a glycerol molecule and three fatty acid chains (may be saturated or unsaturated) Proteins - a sequence of amino acids, held together in a unique three-dimensional shape by interactions between R groups - an amino acid consists of an amino group, carboxyl group, carbon atom, and R group Nucleic acids - DNA or RNA - sequence of nucleotides, sugar phosphate backbone - a nucleotide consists of a nitrogenous base (A,C,G,T/U), deoxyribose/ribose sugar, and phosphate group

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