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Biopolymers consisting of amino acids that fold into 3D shapes and perform a large number of functions in living organisms.

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By just looking at an unlabeled picture, how do you know it is a protein?

I'm learning about proteins and need to understand this concept. What makes this colourful ball of squiggles identifiable? Why is it a protein, and not any other biomolecule (like DNA for example)? …
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