A polymer is a large molecule composed of repeating structural units. These sub-units are typically connected by covalent chemical bonds. Although the term polymer is sometimes taken to refer to plastics, it actually encompasses a large class of compounds comprising both natural and synthetic materials with a wide variety of properties.
Its good to notice that polymers exist naturally as well, such as silk, wool, and more importantly from a biologist's eyes, DNA.
Here are 4 polymer chains pictured below. seeing how tiny these polymers are can really say a lot about how small each individual molecule is. These are microscopic!
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