Both RNA and proteins have a 3D shape but only proteins are destroyed by heat (this destruction process is called denaturation). Proteins have monomers (amino acids) that are connected by N-C bonds. The N-terminus end is an amine group and the C-terminus end is a carboxyl group. Some proteins contain sulfur if the amino acids that build the protein contain sulfur. These amino acids are cysteine and methionine. RNA contains phosphorous because all nucleotides are made of phosphate group, five-carbon sugar, and a nitrogenous base.
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