Proteins are made up of _________?

A. Polynucleotide
B. Polypeptide
C. Oxyacetylene
D. None of these

Explanation:

To build proteins, cells use a complex assembly of molecules called a ribosome. … The ribosome assembles amino acids into the proper order and links them together via peptide bonds. This process, known as translation, creates a long string of amino acids called a polypeptide chain.

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