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What are macromolecules?
Cells of animals and most living organisms have four main macromolecules that help keep their cells alive and functioning properly.
The four macromolecules are carbohydrates,proteins,lipids, and nucleic acids.

macromolecule is a large molecule formed when elements and molecules bond together.
Elements like hydrogen,carbon, and oxygen join together to make up macromolecules.
Each macromolecule is unique and made up of many smaller molecules.

Carbohydrates are composed of three elements, carbon,hydrogen, and oxygen.
Carbohydrates store energy and provide structural support. 
Examples of carbohydrates include sugars and starches. 
The cell wall of a plant is composed of the carbohydrate cellulose.

Lipids are macromolecules composed of carbon, hydrogen, and oxygen. Some of them also contain nitrogen and phosphorus. Technically a lipid is not a macromolecule, but in biochemistry it is grouped with macromolecules.

Lipids are fats, waxes, phospholipids and steroids.
Lipids help make cell membranes and are great at storing energy.

Proteins are large chains of amino acids. There are 20 amino acids used in your body. Your RNA carries instructions to the ribosomes which instructs the ribosome the correct order of the amino acids. These proteins carry out many jobs in the cell.
Your body has hundreds of proteins. Some help with communication, other help with transportation, 
For example, the protein amylase which is found in your saliva helps break down food.
Collagen is a protein that helps bind skin cells together.

Nucleic Acids are long chains of nucleotides.
The molecule DNA is made of cytosine,thymine,adenine,and guanine.
Nucleic acids are important because they contain important genetic information. 

In summary
There are four main nucleotides found in a cell.
They are lipids,proteins, carbohydrates,and nucleic acids.

What are macromolecules?

Macromolecules-Beginners Guide
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