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A pure protein should normally have...

A pure protein should normally have

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To solve the question "A pure protein should normally have," we need to understand the structure of proteins and how they are formed. ### Step-by-Step Solution: 1. **Understanding Proteins**: Proteins are large biomolecules made up of one or more long chains of amino acids. They play crucial roles in the body, including catalyzing metabolic reactions, replicating DNA, responding to stimuli, and transporting molecules. 2. **Amino Acids Structure**: Each amino acid has a basic structure that includes: - An amino group (-NH2) - A carboxyl group (-COOH) - A hydrogen atom - A variable R group (side chain) that determines the characteristics of each amino acid. 3. **Peptide Bonds**: Amino acids are linked together by peptide bonds, which are formed through a dehydration synthesis reaction between the amino group of one amino acid and the carboxyl group of another. 4. **Polypeptide Chains**: When amino acids are linked together, they form a polypeptide chain. This chain has a directionality, with one end having a free amino group (N-terminus) and the other end having a free carboxyl group (C-terminus). 5. **Conclusion**: Since proteins are made up of these polypeptide chains, a pure protein will have two distinct ends: the N-terminus (amino end) and the C-terminus (carboxyl end). Therefore, a pure protein should normally have two ends. ### Final Answer: A pure protein should normally have two ends: one N-terminus and one C-terminus. ---
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